Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2a5817e6da0693…

MALICIOUS

PDF

74.3 KB Created: 2021-04-04 19:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5677bdf2c2174fa481e3c999e88234d SHA-1: 5ade4a86593db0ad6e40640e92937c0bff51d493 SHA-256: 6d2a5817e6da069322440e4f0e3ad27781fda31fe8aecf2cd555b46936f4823f
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://xajibur.ru/123?utm_term=plane+games+for+android+apk PDF link annotation
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/846774.pdfIn PDF document text
    • http://detonicinitalia.website/77760734541buxso.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/NbichcU/77080162824.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/icoicv6/super_bomberman_r_switch_metacritic.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/dnqEngc/94444037083.pdfIn PDF document text
    • http://migerov.xyz/gobodenixitim9swzn.pdfIn PDF document text
    • http://marketes.pro/gukupirjrpi.pdfIn PDF document text
    • http://soldonlittleton.com/375240817928i4di.pdfIn PDF document text
    • https://jedamebised.weebly.com/uploads/1/3/4/6/134651392/konoputezikas_sajoko_falanetase_titare.pdfIn PDF document text
    • http://spencermcman.us/16569809521vhgcs.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/coRlW2X/7871105235.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/bF6jeFc/strike_fighters_2_vr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_0aae17d72791402ebf3a79f0d6b3cd39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/playerunknown_s_battlegrounds_key_free.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_0fecc1eac7cc4ae6b18fd9d346872505.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/naruto_shippuden_wallpaper_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 5428 bytes
SHA-256: f12d06681baa3b71cb65b45a279a2cd276e19c5d24d5148568d5d26f3a9f4c05
font_01_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 10680 bytes
SHA-256: 00787ed2b434596753d94babbcda2b94afe46a3845f26aba67f1037ae238e8d5

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