Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d2a85bfd4c23ea…

MALICIOUS

PDF

78.5 KB Created: 2021-05-12 23:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c1d07008487e8dfdf2b9e34877cc60a SHA-1: 1b41a8826ed8f1da357001244005835273b4e141 SHA-256: 84d2a85bfd4c23ea8a0a4c6276640ade5e9d5600be6a0e2721364debb69e931c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://leonvi.ru/strik?utm_term=why+is+my+thermostat+not+kicking+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454561/normal_604b10a2f3c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fdacb569cd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_600db17440f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_6064e6fbf1ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5fc6be0f5af40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5ff92e2e1dc8a.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/hjjhTRo/gun_fight_sound_effects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_60164acccaf07.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/acca_f9_class_notes.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/24166161632.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/64257763512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_6056ca2ca364b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_6019db4f389ad.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/tifNhjs/love_heart_live_wallpaper_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/lzD5hbm/axes_io_mod_apk_unlimited_money_android_1.pdfIn PDF document text
    • http://lezepubaj.iblogger.org/zero_conditionals_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_600f5c0955ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5ff42925c8ea4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5ff2f6cd444c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozadowosib.rf.gd/59486239194.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_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 5360 bytes
SHA-256: d58a02099d35471351135811ba0f1bbdde8b950e50b2c3b70d005abb20889b9d
font_01_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 11464 bytes
SHA-256: 399b34283882b0d560faa19f532c9eede5503e542d98c9858c09be01a7bb03d0

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