Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf45b48cbfda814…

MALICIOUS

PDF

68.1 KB Created: 2021-02-22 21:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 73e9734644dc45d8c79016e887128dc1 SHA-1: a0f388e0b722eae73bf0334bf32f94cc95bbdb2b SHA-256: 1bf45b48cbfda814f981b1d59d8a1080c8eaf8c2e39160d576dd6c1eb2bd60c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Chemistry an atoms-focused approach', which is likely a pretext to disguise the malicious intent.

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 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://maypoin.ru/123?utm_term=chemistry+an+atoms-focused+approach PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366633/normal_60046f4997b95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5fc800c4e800c.pdfIn PDF document text
    • https://cdn.sqhk.co/jilazelitor/F1RaifB/kubozejejevifapasovumaja.pdfIn PDF document text
    • http://wiinorama.fun/86922146722iq3yy.pdfIn PDF document text
    • https://fofomobagukewe.weebly.com/uploads/1/3/4/3/134352826/ximot_sulalexesibef.pdfIn PDF document text
    • http://cabinetsop.xyz/six_sigma_green_belt_project_reportqnozp.pdfIn PDF document text
    • http://natgood.space/the_theoretical_minimum_downloadc3rox.pdfIn PDF document text
    • http://geleostone.online/idle_heroes_stones_guide5joqk.pdfIn PDF document text
    • http://kdghy.online/45756899775j37iv.pdfIn PDF document text
    • http://familyit.info/superdry_ladies_jacket_size_guidep3dwx.pdfIn PDF document text
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/8296240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_602c28bb42fd4.pdfIn PDF document text
    • http://philonio.online/wokugiio81e.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jhcgcgh/kodi_lee_you_are_the_reason_mp3.pdfIn PDF document text
    • http://mx50off.pro/lifeguard_manual_june_2017w0zjk.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/qYYsjcB/anonymous_chat_app.pdfIn PDF document text
    • http://reduslim-siteofficial.site/59662954976ufcr6.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/tesotiwapax/36879807362.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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 5404 bytes
SHA-256: 8f9bfbdda38135021f41214098e5ba592db72527eca2177a72451474b5f0b545
font_01_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 10312 bytes
SHA-256: 39cca870ba464eaee5d9d608316ae07fb6886fe3bce1317c2a8998ca32a59cfd

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