Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d535a9bce28245e…

MALICIOUS

PDF

73.5 KB Created: 2020-12-27 12:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2c1837facbfb17b57e0c2f85f7cb4edc SHA-1: d7ec8210b9d8d4d78d0730bf9411ef503aef6ce6 SHA-256: 7d535a9bce28245e709e78e896b87348b7c6713d5bd1a01697a34422184086be
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate a potential for exploiting PDF vulnerabilities or embedding malicious JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=trendsport+stroller+recall PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449965/normal_5fb75ef6cf732.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/baxijosisadima.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/1492622.pdfIn PDF document text
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/21c2e359cca7de.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/sojidoxofokumotiv.pdfIn PDF document text
    • https://pozitolize.weebly.com/uploads/1/3/4/3/134330731/5452816.pdfIn PDF document text
    • https://zumukematil.weebly.com/uploads/1/3/4/7/134716366/1458338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_5fa8b62ae5a96.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/lujil-basujedokex-soxaluwifimi.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/7498154.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/vuxixuru.pdfIn PDF document text
    • https://mubopizolofovo.weebly.com/uploads/1/3/4/4/134442803/kakegopigawawubaroz.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/8d913cee-6efc-4bdc-97d8-90c89f96b53f/7659718772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b736d58f-1eae-4c0f-b021-cf3b1532f80c/fun_facts_about_mercury_and_venus.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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 5016 bytes
SHA-256: 0af8e56bcb09c6586ac3307f80742825e8558b75e8d3fafa0a7d98689e350eac
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 11340 bytes
SHA-256: d30f1dd1dfee2424844fde1040e06abd9b1e7588cfff3d59f75a8acdbc1c39f2

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