Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f22e852b270ada1…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 20:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f9d38a3e9226c282a08ecd418aab0bee SHA-1: 910399704fbecefbda89d21d6125bd966b061dea SHA-256: 8f22e852b270ada11712ab4a40a28bee397453ea04d978499192c942ac01aba5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=antares+harmony+engine+manual+pdf PDF link annotation
    • https://lorolefe.weebly.com/uploads/1/3/1/8/131871725/4365935.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/arbitration_act_zimbabwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_6057a13c75165.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/blum_clip_top_blumotion.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/sikifav.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/hUjagdj/sonic_riders_zero_gravity_pcsx2_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_603bb20babee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6035e99370005.pdfIn PDF document text
    • http://xivekoto.medianewsonline.com/ryanair_case_study_business_strategy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366050/normal_6007d11c691dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6015633fde1a1.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/dosugelademifapudavibod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5fdd848ad232f.pdfIn PDF document text
    • https://gapivawaki.weebly.com/uploads/1/3/1/8/131857152/nujuneduneja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_6063f659d9f02.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/problem_solving_and_decision_making_2nd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_6015e5fca3591.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/eidPjij/lizunosow.pdfIn PDF document text
    • https://wapafakomix.weebly.com/uploads/1/3/4/7/134740591/bafidugi_lubumok_gezetozironum_rogapotowiwit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5544 bytes
SHA-256: ca4696040da00d42281d2c53a15717a8dd0d3eb266fe5099e56d10e5a8ddf63d
font_01_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 11068 bytes
SHA-256: f16f235a4b279f18291aedb67fb63fe177339c8cdb872a3331c4994b71fbefc5

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