Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7651b3e56d06a1…

MALICIOUS

PDF

74.9 KB Created: 2021-04-07 01:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad8d247d60ca825082e2828497653b6f SHA-1: 3e4c9e90d815f36cadfb7437fa89d4918eae507b SHA-256: 8d7651b3e56d06a1426f3a8fb13930505476b856030ab5cd6587961dfee83bcd
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains a large number of embedded URLs, with at least two pointing to known malicious or redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded content, though heavily obfuscated, suggests an attempt to direct users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=android+backup+photos+google+drive In PDF document text
    • http://robot3.site/71313372032by4xm.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/5812909.pdfIn PDF document text
    • https://cdn.sqhk.co/juropenux/Pjbnz0s/guess_the_celebrity_quiz_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/HjacL2B/66337264912.pdfIn PDF document text
    • https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/fazama-neweguxerimad-sefit.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/bigugupetewojo.pdfIn PDF document text
    • http://fionainthefield.org/jepelunedevqayy3.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/pebopawa.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/eaa8b703-77f0-4685-a156-d37ad4c9b59b/risovir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436eef43-59be-48d6-b154-5e670abf9d66/27330800683.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_ae50bc775cfc4652a9541f0240d2946c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/rogomukutawerevomideso.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/biotransformation_reactions_ppt.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_a34c59fc63c44541a69f47ef729f0692.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/english_grammar_rules_for_competitive_exams.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/84197117367.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_0329d77bb92a49ba83647eceb050411c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4d6e5c-343a-457f-8ff6-678473fec4e3/tozunuweb.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/diabolik_lovers_game_ios.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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5588 bytes
SHA-256: 231e944b816e0876c1c37de6d1b51ab55d20404c5820b49f43ac0375dd38f159
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 10996 bytes
SHA-256: be81def649487568d1d40325c3a27e85f9460710a4f0a6691db929a9ab14082b

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