Malicious PDF — malware analysis report

Static analysis result for SHA-256 e698085e1a8623a4…

MALICIOUS

PDF

73.1 KB Created: 2021-03-22 00:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: acd43263b2855cc32bd6e9c4cf79f305 SHA-1: dea20464c6678aa387a91939a881af6993f516bc SHA-256: e698085e1a8623a473ee5cda5e53695059d027597f680ca17a5086a510a92651
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=attribution+theory+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488130/normal_5ffd046a825ad.pdfIn PDF document text
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/pisuwotonobulo.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/UHihdXa/buy_and_sell_trade_offers_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/ujjgfij/38435959089.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/fhj3Nnx/talugukewi.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/Njj1ijY/17797001802.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/6017009.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/ihjIjTA/lg_washer_and_dryer_smart_diagnosis_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_60196df620aa9.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/ji9iagh/14061083467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_604d2111ebdb7.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/gdmghH8/bigoxemutigipexinanilofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_602570ac3f178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601d2b4907512.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/jeVhjhi/spongebob_moves_in_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/sjdjaEr/epson_iprint_para_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/zobarimumuje/9jcjjig/cube_wars_battle_survival_descargar.pdfIn PDF document text
    • https://bididanigatozum.weebly.com/uploads/1/3/4/3/134314142/menedelufawosoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/igjbMTc/reziporosex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokigabexotuk.rf.gd/35948386476.pdfIn PDF document text
    • http://zebafuvevejol.epizy.com/maguje.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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 4940 bytes
SHA-256: 49a338216b915b9f9a09c7059d255e2b96e55ecc60c29ac70965519959687d76
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10180 bytes
SHA-256: 38a9884f3e50483d7702b1719898d56780ca0c4873215ac8f8a356f3b015e013