Malicious PDF — malware analysis report

Static analysis result for SHA-256 455d4692e98e337e…

MALICIOUS

PDF

67.3 KB Created: 2021-03-30 11:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4087f5b139a54e33a5ca9d646d9cb177 SHA-1: 0dcb110bdad9949e5f1e481e0149a359a21366ad SHA-256: 455d4692e98e337e1a2e2ca0fe50c924b98cb9df135eaca62120855e952f1c99
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting or less reputable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic identifying a significant number of external links. While no scripts were explicitly extracted, the nature of the links suggests a potential for distributing further malicious content or phishing attempts.

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://zajinet.ru/award?keyword=spoken+english+pdf+free+download+kannada PDF link annotation
    • https://jipujiro.weebly.com/uploads/1/3/1/0/131069764/dovabinav-pokepibebelojan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5fdb66457db4c.pdfIn PDF document text
    • http://sedouche.xyz/fuzatoeeex6.pdfIn PDF document text
    • https://ginijamuda.weebly.com/uploads/1/3/1/4/131409148/vekemibemipifodasi.pdfIn PDF document text
    • http://graatorama.fun/74554793219jyrat.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/bibaxopazuxilalu.pdfIn PDF document text
    • https://zogomidovuga.weebly.com/uploads/1/3/1/6/131636914/xefajurowewogu-gubugetisum.pdfIn PDF document text
    • http://hermidkovo.info/which_python_course_is_best_in_coursera4rklz.pdfIn PDF document text
    • http://bestsaleshopin.xyz/zodosusarozalepb0xvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_604d74b2188bf.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/vavotejebid_dexafi.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/1c4a1bb9d.pdfIn PDF document text
    • http://vejexoxidinu.iblogger.org/64763728988.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2aa4ff-f568-4018-ad96-8217f4ec4dde/hp_p2035_toner_price_in_bangladesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2f9d0a-dcfc-4786-b93c-b8a8c0d742c1/70642622591.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/kiwovoletuzubido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accee80d-8d79-4c57-abf9-a399267dfd5a/48569668752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5c7484-e99a-4ceb-b216-c7c5ec3399e0/35961493214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb546d20-7701-4364-ba97-2356556f1b57/garmin_vivofit_2_user_guide.pdfIn PDF document text
    • http://rivadejupogutun.epizy.com/zuditixuni.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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 5560 bytes
SHA-256: c2f3de362706e0fafc9bfa9236da667459b83bff1729fc115181931e73a2bd5a
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 10308 bytes
SHA-256: aed251a37cbc8478b52655545ac1df10dbb7e1a4e7bba5cdd02566355de4c7cc