Malicious PDF — malware analysis report

Static analysis result for SHA-256 82371c293644e4ff…

MALICIOUS

PDF

92.9 KB Created: 2021-03-22 14:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0dec69742be0b729b4887baf11d8eb67 SHA-1: 2072074f7b82d9c1a64de2368fd4c713166111df SHA-256: 82371c293644e4ff5847c6d63ae0078043f6da58405d550f433b6d5fa4ef94f7
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF documents. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=how+to+turn+on+bosch+tankless+water+heater', is designed to appear as a search result, likely to trick users into clicking it. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic where users are instructed to provide a password for an archive, often to bypass security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=how+to+turn+on+bosch+tankless+water+heater PDF link annotation
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/abe49.pdfIn PDF document text
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/8450877.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/OLtijfo/13142663886.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jqpd2jf/expeditions_app_update.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/c439b4a94c531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ca451edf-b07a-497e-a7d9-a8c54397c730/werigomijagemipola.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_7909dc0e41e145b683c38823aa166505.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/64899063557.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/42628027999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed701b2-8a49-43ae-bf9f-9d520f3295ac/wezerisamafafolanorila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290b4974-a92d-4fca-9c1e-b3ae148f8312/why_do_guys_not_message_first_on_dating_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/cardi_b_money_performance_grammy_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/42693811053.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/bloons_td_1_free.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_cffcf85a1bef49fbb1b57940a44a208e.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_73521a6ac4974338b6a8e5dcee7c6b46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/11944139236.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_ab7013a8954d4d0ab9487d54e5a9787c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/115d40b4-f8a4-4d86-b477-714da4340ecc/75682869845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ea3aa0-521d-4169-a5c6-841b78b07e56/xutowavivolofizekosew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 2912 bytes
SHA-256: f1585241b59a1002e627af24859d8bddc2a41f5101ead6a7a290360bc82d6b36
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 4976 bytes
SHA-256: 12a0059bd8d9d36fe1d3eaac796de431d10a8ceb28ed8cdaebe5409c78923e79
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 12320 bytes
SHA-256: ff18fd7a47ed17adb1e320c9e3050c919dc76f1cc9df15bbc55dfd75d336cd08
font_03_sfnt_off00013f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F72 16276 bytes
SHA-256: 09343ab8fd6a71046701f7c7dc09e364297ac43a536cdbdd538f682b7e4b01b1
font_04_sfnt_off000154cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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