Malicious PDF — malware analysis report

Static analysis result for SHA-256 0438c8bc433457b5…

MALICIOUS

PDF

89.9 KB Created: 2021-02-22 22:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c023cabded7501fa2d550c2c21c8379 SHA-1: ba359550693aeac36754dfebbd37f84955eac8fd SHA-256: 0438c8bc433457b59bf8def7a5401aefc2c0428b43fb3207f6df370c35831e4a
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 0.9995

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://bologen.ru/strik?utm_term=how+long+do+craftsman+snow+blowers+last PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5fca966522586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fe34b36820ac.pdfIn PDF document text
    • https://xaxaguxoludu.weebly.com/uploads/1/3/4/5/134519627/perapamewuris.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/ejhviFP/fidget_spinner_games_on_crazy_games.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/pvhjf0F/28557347438.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/zimegatogujirorexob.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/woworulukikil_mijed_mobofidote.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/8833efce4baba6.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/vopike.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/xSjfhjM/munesunegemoranazi.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/dJ6ghgc/22017135940.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/grCaidT/85136503623.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/dihZ06b/galaxy_striker_alien_shooter_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412173/normal_5fe029b828de5.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/cid5XJO/hotlink_definition_food.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fc621ce2e66c.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/a83f1eb5.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hdYhiET/top_offroad_4x4_simulator_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fugewad.rf.gd/net_framework_4._5_2_redistributable.pdfIn PDF document text
    • http://zejeganemumejow.rf.gd/telecharger_journal_algerien_gratuit.pdfIn PDF document text
    • http://ropedeni.epizy.com/zenarewivepujit.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_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 5276 bytes
SHA-256: 68aaeaec18dd19b526cf87f3ff64e9d4a0382ca6823560ff04a2a5928ff50b9d
font_01_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10952 bytes
SHA-256: 49606b7fd6e2fab1a710b8c403485e26e3a52633ecb768c0bfb409076696dc38
font_02_sfnt_off00014ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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