Malicious PDF — malware analysis report

Static analysis result for SHA-256 085973f880ca3018…

MALICIOUS

PDF

80.3 KB Created: 2021-04-15 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a2b1d834787115ae733e4915aad766b SHA-1: 81bd1da7de3144d12b615d3e3ee1681910b4870b SHA-256: 085973f880ca3018581240a8bd38e7d05656bcfc603113ede46dd3d939cc2a66
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=uppababy+vista+vs+cruz+dimensions PDF link annotation
    • https://cdn.sqhk.co/sabiseleto/MhbxMia/cute_kitty_wallpaper_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/gjjf8pn/madness_combat_11_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492892/normal_60654641d56db.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/2hcLigH/kumirodaworiweri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_602da777d4f19.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/haZwL4N/cake_pop_recipes_with_cake_mix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_5fe92984babf5.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/bhbizij/58041542136.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/bopowexej.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/how_many_acts_of_terrorism_in_the_us.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/MQijgh9/3d_snakes_and_ladders_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofezaniv.rf.gd/86464595706.pdfIn PDF document text
    • http://domojemaki.rf.gd/is_kali_linux_for_beginners.pdfIn PDF document text
    • https://fc59733d-949e-4df9-817b-fea2515c5cc7.filesusr.com/ugd/689329_d40db2619e5a46bdb57e754288556ca3.pdf?index=trueIn PDF document text
    • http://fijinibegomiba.rf.gd/attunity_replicate_6._3_user_guide.pdfIn PDF document text
    • http://giworutiw.myartsonline.com/rozuzekuj.pdfIn PDF document text
    • https://8e75e8be-0f37-480b-85ac-641553c1acf9.filesusr.com/ugd/a4a1ce_17600b183a834bf7bd749320cb272f61.pdf?index=trueIn 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_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 5528 bytes
SHA-256: ff1ccab5079e560df77355611e4d0b11df91898cb77d6a6e6cd7784b2809e5a2
font_01_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 10608 bytes
SHA-256: 973e55c24a54f6e8ab84feacdc73ed6ab29bb527c57bbbcbb8bbc90ce498f7d2

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