Malicious PDF — malware analysis report

Static analysis result for SHA-256 54156a99ad13815a…

MALICIOUS

PDF

82.3 KB Created: 2021-02-15 03:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cd88d3f9d874be8547959c483e0b05b8 SHA-1: 4c2762bede17ce362a6da932f75ba4ffb3383b74 SHA-256: 54156a99ad13815a369bf82ad1c7880ac8d26e13d6a4cae0fe1a93e75847c3e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to boost SEO, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'maypoin.ru', which is suspicious. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution by redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=summoners+war+necro+dungeon+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fdcc853a5590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_60025d8a763a4.pdfIn PDF document text
    • http://boothattendant.com/rikugadikemeri7ypsr.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/d3eb1ac0b66e2b.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/RmMpjiU/not_supposed_synonym.pdfIn PDF document text
    • http://money-team.site/675981945734iwf9.pdfIn PDF document text
    • https://lenumerizak.weebly.com/uploads/1/3/5/9/135962539/68e09587.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/88ac312.pdfIn PDF document text
    • https://kugatovobubusub.weebly.com/uploads/1/3/4/6/134680339/6abfebc9e8d2672.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/gesajab.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzefoke/gjihbih/balloon_tower_defense_4_mod_apk.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/vapuxunigozuwu.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/5829852.pdfIn PDF document text
    • https://fopezifu.weebly.com/uploads/1/3/4/7/134717551/zegigukewijovakavini.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/xofilosozujinelitek.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/pamekomirefi.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/free_worksheets_on_discrete_and_continuous_data.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/85252467187.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_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 5424 bytes
SHA-256: 0fdf7e055f1b4fd308154db1cd88da95cf64a8a4c10756f4f9a3f3be88d92f69
font_01_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 10472 bytes
SHA-256: ab53394c51235014747314bff649ff3452e93dd6640667b3f0283a28a85e6041

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