Malicious PDF — malware analysis report

Static analysis result for SHA-256 a726e6da1abf9cd7…

MALICIOUS

PDF

69.9 KB Created: 2021-04-05 06:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87a3196582441f9d0c6feeed64dd26f7 SHA-1: 5a70832864fd0f90f3b17d8743b14591aa8096bb SHA-256: a726e6da1abf9cd7ba5b223c039ae80f50e5fc1c2b740c3a310519587ee40b7a
186 Risk Score

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://lozipotod.ru/123?utm_term=guide+invocateur+titan+quest PDF link annotation
    • http://wobufiparezir.medianewsonline.com/14704402525.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/jihbVgi/60898435372.pdfIn PDF document text
    • https://nosobafib.weebly.com/uploads/1/3/1/4/131438228/zivoliw-lulamasolelajix-robisarinutebu-fobolunol.pdfIn PDF document text
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/9025392.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/hagixGr/accounting_information_system_meaning_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/gcyieic/gutepa.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/fmehaj8/hello_dolly_songs_in_wall-_e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_49d5391b71a444e9867305a05756a440.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/95579050935.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_bf3ea41f77e748708c0ac24f8974ceea.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_aa8789dbf3bc468e95ad0225234507f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/video_trimmer_for_windows_7.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_37f26a31bf0d4e72bf88d384eb3de26d.pdf?index=trueIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_3a624e65bd3142ceb72c7a7851ae8a85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/goosebumps_tv_series_episode_guide.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_3c7b86edd8094f6e8491abbafdaa4f21.pdf?index=trueIn PDF document text
    • http://duziroro.myartsonline.com/is_456_amendment_2020.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_d7b98bc444bc496096049db47e22a95a.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_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 5116 bytes
SHA-256: f3c782bf9ae19a999758ec0b4871ec4bf4737f8745a621df081527f61e35a583
font_01_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 11936 bytes
SHA-256: ecac09b462b239c93b222afba6539e9127ed784a79f2c7522ce4a522c275ab07

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