Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a847bdf5dfa6ef…

MALICIOUS

PDF

85.3 KB Created: 2021-03-14 09:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1bdf948aff0b3ce607a371e2fd898fb SHA-1: 5963fd5ea159cca3351d157bffcd0433bb954c75 SHA-256: 35a847bdf5dfa6ef5e3a368739ff50778899a4a284dd65b2ffdd4719f5634d03
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 0.9997

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://jumiwimov.ru/strik?utm_term=weather+and+climate+study+guide+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fe018c05c889.pdfIn PDF document text
    • http://imkl-checker.com/94618391663l8it4.pdfIn PDF document text
    • http://fullstacket.online/33734204867s1vn4.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/51f28bc.pdfIn PDF document text
    • http://gawajix.iblogger.org/44929990705.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/42844443247.pdfIn PDF document text
    • http://yewes.fun/technical_english_syllabusgevvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd656fd39b03.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/jijgVhg/classifying_chemical_reaction_types_worksheet.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/qualities_of_a_good_wife_in_the_bible.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_602c05597ef89.pdfIn PDF document text
    • http://slamelina.website/wallpaper_ben_10_alien_force2tq3s.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/RjeifKK/8563631659.pdfIn PDF document text
    • https://wasafigazepez.weebly.com/uploads/1/3/4/5/134586721/6943810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikaroko.rf.gd/2484776289.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/54533151423.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/hp_-_stream_11.6_laptop_-_intel_atom_x5_review.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/73873161387.pdfIn PDF document text
    • http://kixulal.rf.gd/xinatalanodutet.pdfIn PDF document text
    • http://nofufofivazogi.epizy.com/what_does_error_code_1001_mean.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 13268 bytes
SHA-256: 1a0d123745438405d14c1210f8d2337890e4d201c0a5b415acb9e62e35c7fb95
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 5624 bytes
SHA-256: e19fc0c76a20b0316841e6d48b20e57e7f1efafc4c767e7d31baf95d183f50a4
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 11764 bytes
SHA-256: 129a25390995e1ed28393b492dbac008abb8937eab68327eb51ee3c290d9fa9c

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