Malicious PDF — malware analysis report

Static analysis result for SHA-256 b169f5bab16ba8f9…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 07:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6abea107534b5296d5e3e26388873ce SHA-1: b7d54af7e66ded99a67db6056f4b31748cab720c SHA-256: b169f5bab16ba8f921a3d743142667f3e0359a84f6257b170bed4695267a8ded
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=calendario+lunar+2020+argentina+pdf PDF link annotation
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/mazazewafuburaxeve.pdfIn PDF document text
    • https://vinezizonevo.weebly.com/uploads/1/3/4/3/134320549/gezutesixorovepid.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/guzetisizokolipusesa.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/9389998.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/mijelizo.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/medevegilojitejul.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/91043332845.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/sopumotowebawaku.pdfIn PDF document text
    • http://xovijezup.mywebcommunity.org/61184478587.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/85789067986.pdfIn PDF document text
    • http://kokoponabile.iblogger.org/wuwetujelevoji.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/john_stuart_mill_utilitarianism.pdfIn PDF document text
    • https://gasilarax.weebly.com/uploads/1/3/4/5/134595303/6380679.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/zidavutiwinadule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedowep.atwebpages.com/crappie_fishing_lures_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6b9798-c7b7-4f65-b195-bae0efcaabb2/24696801143.pdfIn PDF document text
    • http://bunebuka.rf.gd/enuresis_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e308f577-9270-4fde-8d7a-d567bd6e89a9/xorenexa.pdfIn PDF document text
    • http://gerutijotinana.rf.gd/poser_pro_11_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65135943-d154-4f6c-acf5-6e43b0a0bd25/97494104466.pdfIn PDF document text
    • http://puzuniposodaf.epizy.com/87963228694.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/pendekatan_metaphorical_thinking.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_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 5212 bytes
SHA-256: 502517434c32b3c2f5fb322217d12ca6889c8764aa1f56aea7763750e8576999
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 11680 bytes
SHA-256: be79a2bee704ac5bb6657776d37fb9f5b48fd2b12ec0fff4faaa969457547b9d