Malicious PDF — malware analysis report

Static analysis result for SHA-256 d644da8b19f1d0d8…

MALICIOUS

PDF

82.1 KB Created: 2021-03-07 02:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43758accaf8e5e844b51fb9d3b917a97 SHA-1: 091627c490c6d5c02f510aa8dd2ef1fba209b903 SHA-256: d644da8b19f1d0d8a4e3c1eed8138ed463572e0e91d31c92f4cc8dd09b344353
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://mezovuduw.ru/wb?keyword=andromeda%20strain%202008%20full%20movie%20free%20download', is likely intended to lure users into downloading malware or engaging in phishing. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command execution patterns within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://mezovuduw.ru/wb?keyword=andromeda%20strain%202008%20full%20movie%20free%20download PDF link annotation
    • http://wotidoteked.mywebcommunity.org/lededimaxugalirasifoja.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/kizejogavozaxe.pdfIn PDF document text
    • http://liketime.online/58522191196znwbf.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/6f1273e10a6.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/6bdc233b.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/4092368.pdfIn PDF document text
    • http://swiss-gear-top.xyz/gafejutoviz4xpnl.pdfIn macro / runtime command snippet
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/zamiwa.pdfIn PDF document text
    • https://resivoviwogo.weebly.com/uploads/1/3/3/9/133987135/7966502.pdfIn PDF document text
    • http://nat-fru.space/lubagefewovigetuniroee5tl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd14a302-93b2-42d2-911a-dbf13f5066cd/quincy_track_club.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e28c50c-0baa-43e1-a5cd-e41361568afc/9012154011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4215c12-f667-441c-9fb5-502f5acc1866/41609829701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a080884c-7edd-4f56-b5cf-0e91ba337f2e/dark_force_rising_audiobook_free.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/how_to_do_wave_curls_with_flat_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346363c8-9395-4775-9a58-4c2c28262195/75000398763.pdfIn PDF document text
    • http://riveminigokoxa.myartsonline.com/40765662173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b358d5a-7676-4c41-ad92-891d56f585fc/the_boys_comic_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd66548-f68e-4d38-90a4-7139c0c33365/54573032646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7bd905-b2d9-4f4f-8c99-ebf241d79367/how_to_connect_toshiba_ct-8541_to_internet.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
    • https://uploads.strikinglycdn.com/fIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 5664 bytes
SHA-256: 29ab0ce7a65dc2f2bc5845f3f7cc07263dfc82fa5b54043b2d79a0c4d68575fc
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 10920 bytes
SHA-256: a8d169e9e65f3c6463a62ae289d56f35d12189662248c6198c0b1a445a0b658d

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