Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3f10fe06d79eb1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 08:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a7113b12bcb162a62afb72f9989fa0ff SHA-1: 5f1a002709931ca9cbfcf52f607c4c2c08543fe8 SHA-256: bf3f10fe06d79eb1ac044351ce1f025b6b55f494a3963992f7192a2e46ba566b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL pointing to a domain associated with phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=porter+cable+air+stapler+ts056 PDF link annotation
    • http://karma-911.com/newexepilofiwumkpmlx.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/89350375201fq1z3.pdfIn PDF document text
    • http://banepudota.iblogger.org/prefix_and_suffix_worksheets_for_5th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_dbf082664564427b8d080845e999ea1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e3e998-e596-4e3e-9e0e-c762a46c4255/9577924135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307ff9d2-6752-476c-8732-d3a81b924edc/para_q_sirve_la_moringa_con_limon.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_62d80e08172346ba93c9da85f4e03559.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_4a58e12511174295824a7f394f9b2c57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3032c95-6c53-4a80-8cc4-1f43bf07ba57/51129140379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f0bfe6-b0f4-4106-8966-b362dd105c0a/35203536435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab4602c-fd65-48f4-9ef6-70d4b3d9e990/who_is_leah_with.pdfIn PDF document text
    • http://roxixelojoxas.rf.gd/tutorial_java_swing_netbeans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cac4041-76f7-4b20-916b-3f83cdd74991/botuvatavedutolabozipafix.pdfIn PDF document text
    • http://guxudapese.epizy.com/59991316610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4238653-ab84-4d9a-99a9-f4eb9374b802/fomodisaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32a06f3-c766-473b-8ee5-6bfcd084f4ef/esv_bible_online_free.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_b223315f24d84694b628538dc034e5fd.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_9f1faed4fb0b47d38bf562cede7bec77.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_bdd27f65dd47446c985a8b0798f29e52.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_f7eb91b5071445e483875dd816e34df9.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_6dadf953edf242ae991f44946bbad874.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fdc2b2-bb84-4e65-a114-6ea178aef852/92817694525.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_42e17a881b0d4eb8ae43d23394e9bae5.pdf?index=trueIn 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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5488 bytes
SHA-256: 4db17947ec534974a14bebb47c3e3767125532361a40399dca3efaa53bda6673
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10796 bytes
SHA-256: e5fa334206eae499a4743d64c33b5a3f6ff4d24ba2d357c5c86634fceb4ca814

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