Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a3253494aeefac…

MALICIOUS

PDF

72.5 KB Created: 2021-05-19 20:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a272dd9416e2b8c4c5141c80118ff0b SHA-1: d549d9e899680deb3e3a4878b681428f937b5b3f SHA-256: 78a3253494aeefac43e5156f14cdbca0b43115b94b9b6a885ad138a5c2756ca6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://jacksth.ru/strik, is likely used to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=d2jsp+price+guide+2020
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fe79d279297b.pdf
    • https://vamolitewule.weebly.com/uploads/1/3/4/6/134670516/samamudito_loxapo_vikimuvija.pdf
    • https://static.s123-cdn-static.com/uploads/4459914/normal_5feeb089a7f5a.pdf
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff96ecc2bc24.pdf
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60187df7e05dc.pdf
    • https://static.s123-cdn-static.com/uploads/4469860/normal_5fc95af79dd28.pdf
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5fe5a5603b18f.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_60128fab1ee50.pdf
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/vinaxovate.pdf
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/guvirowen.pdf
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/gejugi.pdf
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fc680e3e73c1.pdf
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/4528171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xapota/51356767584.pdf
    • https://s3.amazonaws.com/widiku/96705423258.pdf
    • https://s3.amazonaws.com/xeponodij/bloody_roar_game_for_pc.pdf
    • https://s3.amazonaws.com/sigobija/chrome_canary_portable.pdf
    • https://s3.amazonaws.com/lekelepowo/poxubaxix.pdf
    • https://s3.amazonaws.com/xakusineba/24051703289.pdf
    • https://s3.amazonaws.com/remuv/viwozuzijamubod.pdf
    • https://s3.amazonaws.com/tarizirefevifab/wifiguwunatadoz.pdf
    • https://s3.amazonaws.com/xebuvuwov/denexirulivozawepab.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_off0000dea4.bin
fb43ab9f600aad00170a22f96140d112e27ab815b308c95209c75c3586aaeb32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 5348 bytes
font_01_sfnt_off0000f0fc.bin
bb96465b6e058dd9308da6663a8fc1cd5c61b8128eb8d5e45969cb88f0242fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10488 bytes

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