Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9b2ee0a3daafb8…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 18:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b6379cce832b469b0b464117a569c3c SHA-1: 5bc575b04fe04167ebe7607a4d72cf397cd9e5cb SHA-256: aa9b2ee0a3daafb81cb33593154d81f4231c0efb0382b72b77dcb6e1c872d393
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 0.9997

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=alesis+qs8+2+manual PDF link annotation
    • https://cdn.sqhk.co/revogonesox/boOMEhd/jimerojopabojatesekebexi.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/9hj9iey/i_know_worship_song_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_6034447b8ad82.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/gelis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_604f98cc3fc38.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/hejbLij/startup_financial_projections_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/ejgshef/my_coaching_app_free_for_teachers_teach_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/djeOeU6/lapopororumotugomiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_60437af544bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_601c6a51be86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_600c4816d8cc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_6055115f3d368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fdb19fe0f5b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443815/normal_5ffcaefaf2f20.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/JgfCigo/rc_monster_truck_offroad_driving_simulator_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6052f15467872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_a78447a9368f410fbaf3de6910a6403e.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_61ef9b6c8d454e04a7d3d11558ce4448.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_02a5d97b7efd41e5a6373123704e6c40.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/tajan.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_1a6d1ca08e224f1983df3f7ed1c538dd.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_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 5176 bytes
SHA-256: a03c2297d2b9bde6b3568c95f55f229b03ffd77bc2646ede637c44538284eee2
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 11792 bytes
SHA-256: 3fbfb815f920db1bad616ce5d6df9cfc9338dffd3e1e00d88767bbeaf9de551f

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