Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8489989bc63c47…

MALICIOUS

PDF

65.7 KB Created: 2021-01-13 12:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3bfa5f73e387c129924e808dbde247ef SHA-1: bccd6839be87d5b506b68d7d5f3f01428b07401f SHA-256: ea8489989bc63c4753741ce22838712977e82e4a9a51edd290331a35cf043b0d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing, along with ML and ClamAV detections, strongly suggests malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/wb?keyword=celebrity%20cruises%202021%20alaska In PDF document text
    • https://cdn.sqhk.co/mugejufunij/6hiigSA/36021104985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5ff01f12ed46c.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/f5jeMjd/janewaraxebakazetuk.pdfIn PDF document text
    • https://site-1223979.mozfiles.com/files/1223979/autocad_elevation_plan.pdfIn PDF document text
    • https://site-1247091.mozfiles.com/files/1247091/boron_nitride_nanosheets_solubility.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/OJUjehd/tufusi.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/406522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5f9142079ba00.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/2jhjfij/xfinity_prepaid_internet_and_instant_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5ffb07d431c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5fbd99ab8c5f1.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/2461809.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/jfnqhgb/bezozed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potofaw/88720716260.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/68572685805.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_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 5332 bytes
SHA-256: cc48167500f6ede6dad3755b14ee71ba30013b2b2d3e045f85d4c9d35772cd35
font_01_sfnt_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 11432 bytes
SHA-256: e1ed83a43ae25cda1b478dd5c5f3777931a0dbf21ee76976b8d1f285e6c174d4

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