Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee77441fd41bef4…

MALICIOUS

PDF

76.2 KB Created: 2021-04-17 02:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64a6a691f0a04a5886589b6cce942dd6 SHA-1: be22272acc2a1cf83c1c6b07551efe5108a05195 SHA-256: eee77441fd41bef4d36b6a8637ad483e1a29392fc6037e1ea9ccc7ef9a648dc9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=what+is+a+pimple+on+your+vag PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fd1007d5b6d9.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/zovazejelusoxaxug.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/how_to_check_avaya_voicemail5o8s8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_604e1e9714395.pdfIn PDF document text
    • http://frut-tree.site/ocr_computer_science_a_level_revision_guidem6z5c.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/11dcb8ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493569/normal_5ffca1faecddb.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/650dd5.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/7140662.pdfIn PDF document text
    • https://jubukukovojiri.weebly.com/uploads/1/3/5/3/135306868/3919888.pdfIn PDF document text
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/kejewexelunatixumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_6056462f0ee26.pdfIn PDF document text
    • http://goodsun.fun/mevupajavitatijepyp5.pdfIn PDF document text
    • http://wei-nmvc.com/31656976293ua3mr.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/sinakedorapotepamuf.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/lapenumawireb-gerozod.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/bumepizatijuxezeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/399b2f06-d94c-44ce-aafe-8e858a36039a/45017827251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18c0221-0ac6-49ae-b58a-0c8a356458ff/26639484830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef599ca-5b5b-4a27-a38c-030d1fece50b/chapter_10_dihybrid_cross_practice_problems_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7e8c5a-ab25-4051-8ef9-669f4b72365c/nintendo_error_code_23400_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c21156c-3276-4062-9f88-43a98db42fa4/23693495697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfa9df4-f722-49d4-80e5-c497cfbcac26/bexilupad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef580db-f76f-4f38-b0b2-3516a3e72cf2/20399260143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240f9aca-d851-462b-b9b5-daec675f474f/how_do_i_connect_my_onn_bluetooth_speaker_to_my_tv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 5408 bytes
SHA-256: c77f3adc14a118a03b024bc2d5c7c6601a340633f494a7c091d22036f62b69e7
font_01_sfnt_off0000fef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 10784 bytes
SHA-256: 3532414a525218146926d02c5272decaab34faf331bfe13ce209e705446586df