Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be42f61ac366fda…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 01:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65aea70bd0b5ec2663443fb052956869 SHA-1: d2717161876ac8c0e320e44d94d20bf2e0447e35 SHA-256: 5be42f61ac366fda8521867f64803908132abf4be3fdf04dd3c0aed2391c9ff9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link-farming campaign. It contains a large number of external links, with the primary suspicious URL being https://jacksth.ru/strik. The document body, though heavily obfuscated, suggests a lure related to 'first principles thinking examples', likely intended to deceive users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=first+principles+thinking+examples
    • https://cdn.sqhk.co/xaderipamuva/hbjcicF/27601561859.pdf
    • https://cdn.sqhk.co/gewanunu/arijKnT/53752480759.pdf
    • https://cdn-cms.f-static.net/uploads/4481990/normal_604b457046707.pdf
    • https://cdn.sqhk.co/rolileduvof/bjbfcuk/diamond_shop_free_fire_double.pdf
    • https://cdn.sqhk.co/ledodatefu/hdjjagi/safobonizumeruvaxunaje.pdf
    • http://nizumewuminal.iblogger.org/android_wear_on_iphone_app.pdf
    • https://cdn-cms.f-static.net/uploads/4456372/normal_600f025c635db.pdf
    • https://cdn.sqhk.co/rifelefiw/f5BLgdw/8362425950.pdf
    • http://tasefuvakol.22web.org/rarokejolefuduvumebalefe.pdf
    • https://cdn.sqhk.co/kososojog/ie6icnk/wasupuwefas.pdf
    • https://cdn-cms.f-static.net/uploads/4409801/normal_600ff63d491a3.pdf
    • http://gelivebun.22web.org/how_much_does_a_security_guard_make_in_canada.pdf
    • https://cdn.sqhk.co/jasurisunav/njbiDgh/zuzepi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_9e8f677f657948ba9569c84870b5e171.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_d4437184e79c471dae42c32f7224fe86.pdf?index=true
    • https://s3.amazonaws.com/lolaritemukole/margin_of_safety_formula_benjamin_graham.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/pinoji.pdf
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_01a0ec2501d94cb5b2835ce4ad7e9cf0.pdf?index=true
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_1e7f5ddacf8846c79151a3e66949735d.pdf?index=true
    • https://s3.amazonaws.com/womirofop/bill_james_baseball_abstract_1982.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/62180114921.pdf
    • https://s3.amazonaws.com/lekelepowo/gadibanigaxuje.pdf
    • http://tezuzatarezoz.epizy.com/alternative_hypothesis_example.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ad.bin
fc151d6b34ca55a5321f95b42ac56dfca1fd3abf8d5550f3c278553be448e228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 5432 bytes
font_01_sfnt_off00010b05.bin
f50b1242e881f97f3921eeed6b53a2962b9d81e961c6e68d8a0f524e7f4b6e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 10888 bytes

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