Malicious PDF — malware analysis report

Static analysis result for SHA-256 501c5a61aa141a56…

MALICIOUS

PDF

72.8 KB Created: 2021-02-25 00:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b49058db753cf0e82e9171091dbea62 SHA-1: e28af47dcd7e1e47eeefc369ff7a9e241b762689 SHA-256: 501c5a61aa141a560e1566fd7199f10ade4f49bf9b595ba6cf85fd4da46c540a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The primary function appears to be directing users to potentially harmful external content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=tp-link%20tl-wpa4220%20kit%20powerline%20wifi%20manuale In PDF document text
    • https://boliminukedakos.weebly.com/uploads/1/3/4/4/134494229/319d5.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/2998526.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/mugoxukazopomaf_zudogad_gugivawubame_zuzunuzidejif.pdfIn PDF document text
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/5d20a3.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/banikinexonugukogizena.pdfIn PDF document text
    • http://austritkfa.com/dibigisosuforobuvazaxoh8q2w.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/which_kitchenaid_is_better.pdfIn PDF document text
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/6d6c05e.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/5664464.pdfIn PDF document text
    • http://xrootunited.com/ntsb_investigation_database95a2p.pdfIn PDF document text
    • http://smartline58.ru/apprendre_python_38wyto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5ff8946f8f570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_6029243bd0df8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/1984_wellcraft_owners_manual.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/nikon_p5100_dpreview.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_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 5368 bytes
SHA-256: 784db4183bb8a396120ea8b9414d76fba037c800b82bd77e8951b406f5987d5e
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10720 bytes
SHA-256: 6c3ac6a22df72d31ca0a556d0ebabe16e67cb21548947875adb1ed46ca1fa7c0

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