Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40d8b958f4fb933…

MALICIOUS

PDF

81.2 KB Created: 2021-06-04 04:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46d2c56aef620346373784655f5b0ccd SHA-1: d4591f1adbe985b4a803b3edc392b8c18686d41c SHA-256: b40d8b958f4fb933a1b67f642c889fdafa4655e37a7fbc02705bcd2dde02754e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a commercial product search. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=best+buy+lenovo+laptop+15.6
    • https://cdn-cms.f-static.net/uploads/4386851/normal_605dde5311766.pdf
    • https://cdn-cms.f-static.net/uploads/4485443/normal_602c229050c25.pdf
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/muxofigekog.pdf
    • https://kixesikanunezez.weebly.com/uploads/1/3/4/7/134702505/jenigugagupatovaza.pdf
    • https://lulubuwapi.weebly.com/uploads/1/3/5/3/135318112/xumalutem_dopatopi_kexotimumowu_ponabodibada.pdf
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/gebalozi.pdf
    • https://foseduvix.weebly.com/uploads/1/3/4/4/134491956/0d2c9.pdf
    • https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/5d0291ff7d8e9.pdf
    • https://labejewatek.weebly.com/uploads/1/3/5/3/135399287/xizujumepitolekav.pdf
    • https://mufirurinonezu.weebly.com/uploads/1/3/4/6/134669904/086bc640.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_6028eb8266599.pdf
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5ffa75bdde891.pdf
    • https://static.s123-cdn-static.com/uploads/4369318/normal_60045a110b65f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2eaf87b-835a-46c1-ab11-fafa7b79fce9/52272361029.pdf
    • http://detomipipu.pbworks.com/f/juegos_con_palabras_agudas_llanas_y_esdrujulas.pdf
    • https://uploads.strikinglycdn.com/files/b3bbb429-a256-4dd8-b016-777860803986/wovazidewiriporegudixosu.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144461526/kijid.pdf
    • http://katafuzum.pbworks.com/f/sample_cv_for_undergraduate_scholarship.pdf
    • https://uploads.strikinglycdn.com/files/36ce82ff-0489-4ea1-ab4b-0036365293a5/wulosafaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001c.bin
b01c40d8a2eb899765e22d1b5b7486a37b036ce915f7d32932837213cec320fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 5428 bytes
font_01_sfnt_off000112c2.bin
5a551b73f3f92646803d82631ae0aabc9839acdebaac3e2e9becc2a35c579782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 10916 bytes

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