Malicious PDF — malware analysis report

Static analysis result for SHA-256 afeff3e5040cd061…

MALICIOUS

PDF

70.6 KB Created: 2021-04-05 06:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 804c0ec6a2dae52918c4a2f2f811c813 SHA-1: c51fa45b8d1a484ad79a18bca09f09a9d615772d SHA-256: afeff3e5040cd061323bdd71cfe8748fc116b863ac3d16ae0ef9cb8d1685b72d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to exploit kits or phishing sites. The document body text, though garbled, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content that can serve as a lure.

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://xajibur.ru/award?keyword=libros+de+arquitectura+de+computadoras+pdf+gratis PDF link annotation
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/memakebovogoj-zujodelut.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/64d57fa69fca.pdfIn PDF document text
    • http://sollabs.xyz/wopinadubidabesagupis4qmuj.pdfIn PDF document text
    • http://repair-planshetov.ru/beats_studio_3_skyline_pricexcjbg.pdfIn PDF document text
    • https://bidijogez.weebly.com/uploads/1/3/5/9/135993355/3191799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff4b65b4f396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_600cbe2c1d81e.pdfIn PDF document text
    • https://lojedakefedo.weebly.com/uploads/1/3/4/7/134743006/73352be0db1f36.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/xetoza_xadubijuve.pdfIn PDF document text
    • https://fisofomopix.weebly.com/uploads/1/3/4/6/134603918/1040919.pdfIn PDF document text
    • http://martakkord.ru/509793964as2a2.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/kevigokixilufefaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fe121411ccc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zurutoraxavifes.rf.gd/polosoladogawuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a5e025-0c6c-49c5-9e09-1d8058dc8597/can_i_get_a_new_remote_for_my_lg_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ff72af-c488-4bb5-ae4d-a274e96f336e/how_to_be_famous_on_social_media_bitlife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ec6b2b-4009-4df2-b5f4-5816f4cb32dd/famutezijejewilikamuju.pdfIn PDF document text
    • http://sisotakeb.epizy.com/2471275221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014d88da-cedd-41e2-94f9-bfeadf32158e/34476956383.pdfIn PDF document text
    • http://kimibixapi.epizy.com/16094132638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5654ba-348c-4cac-a292-fdb53d517f84/minn_kota_powerdrive_bt_45_spot_lock_micro.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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 5648 bytes
SHA-256: b82bbc6faac474d5487c77c5d513e1db5e7b58753bc8b13779f6d67147eccb9b
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 11284 bytes
SHA-256: 1e6ec2b9533cf4027d0ad362f9b421cda6ef2b4b825279f89516b45bec4545e2