Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c370a9035e7736…

MALICIOUS

PDF

77.4 KB Created: 2021-05-07 09:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b850983a0a8687fb839e789fc586c5c2 SHA-1: c11381584c5c6a842892003e13a1e8c6949f0f3f SHA-256: 01c370a9035e7736d6b51ef40065854ff6bfa4d2dd8fcaaeffd9f9c57f8710cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest the document's purpose is to trick users into visiting these sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=how+to+take+apart+my+passport+ultra PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5fe1363111bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5ffc2d6359a2d.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/wKggqYH/ark_survival_evolved_xbox_one_size.pdfIn PDF document text
    • http://fringigejy.site/24958392033g7tuz.pdfIn PDF document text
    • http://xtreme-sport.ru/lenovo_nas_ix4-300d_firmware_updatep3t80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5fe6507121436.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/gheLkij/inditex_black_friday_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_6044699653229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_60235381500b0.pdfIn PDF document text
    • http://sezituza.66ghz.com/kopus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5fde10f1bc266.pdfIn PDF document text
    • http://pokypka.xyz/309846697582s1kg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_5fdc41efb1518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_60359455627df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_606e2099015b0.pdfIn PDF document text
    • http://meinekarten.best/clasificacion_de_cuentas_contables_ejemplosc6ph4.pdfIn PDF document text
    • http://timisodagajid.22web.org/how_to_whitewash_black_painted_furniture.pdfIn PDF document text
    • http://trysalon.xyz/pc_sound_booster_software4mx38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bozolukiket.epizy.com/30323417800.pdfIn PDF document text
    • http://viwokapexonilef.rf.gd/vedutilomenasaki.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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5184 bytes
SHA-256: 9ba0884224db6424262f795c220763b37732b51e387053a3218684b98d8304e2
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 11016 bytes
SHA-256: 4b3be883cb8d57669f09910714eb1b9a826dd5a5e6ae8bdd1e77c3d9d0c799c4

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