Malicious PDF — malware analysis report

Static analysis result for SHA-256 027a46dd8aaeb539…

MALICIOUS

PDF

92.6 KB Created: 2021-01-22 09:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 72884273872f38cabe08afc2f6b619e8 SHA-1: 5fa79f6755a47bceed820820eaa3553b517bcc5f SHA-256: 027a46dd8aaeb539e90388db46312b04197401d3ac3921f3151808080c3989d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a malicious document. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to phishing sites or malware downloads.

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://trafffe.ru/wb?keyword=era%20of%20warring%20states%20definition PDF link annotation
    • https://cdn.sqhk.co/wevafofed/apspbhj/btd5_cheats_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_6001d2640ec71.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/xekudakise.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/3ihsjgh/avengers_game_beta_xbox_date.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/chgO0ia/spin_orbit_coupling_constant_equation.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/gM7DiSJ/xofumes.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/83c75dea.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/3635151.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/RQeyicT/dalepuvefofuxenepin.pdfIn PDF document text
    • https://site-1194434.mozfiles.com/files/1194434/xataz.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/ijfhcPQ/griswold_home_care_ohio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367952/normal_60023a6a3bc5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481282/normal_5fe3f5b0b427e.pdfIn PDF document text
    • https://site-1168315.mozfiles.com/files/1168315/drill_master_router.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/36246152799.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/30573656200.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/arcgis_image_server_installation_guide.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_off00012e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 5092 bytes
SHA-256: e0ec09624d5b430081e368f40105e8992599513352a5581de7dbdf1b0c315c9d
font_01_sfnt_off0001400d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400D 11360 bytes
SHA-256: fa9b19c7bce4172af1b0e11dbeedc0f86175f8fd92ef52dab998623301a34220

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