Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e0876dac40e21d…

MALICIOUS

PDF

76.0 KB Created: 2021-01-04 19:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e3735c09fc6716609ad0e65e7848a5a3 SHA-1: 9789df376155e100ff3b10395cf8361307cfc134 SHA-256: 12e0876dac40e21d919cdf32ff512dd2773f0ae5cdc9536a5a786a58c417ae07
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malicious content. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

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://traffset.ru/123?utm_term=tiny+bees+in+maryland PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fb03bc91dd46.pdfIn PDF document text
    • https://pudajimerexinag.weebly.com/uploads/1/3/4/8/134896131/xigexilubunetinegef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5fddc303a9ae1.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/kejixod.pdfIn PDF document text
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/potewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_5fdf59f4c07ad.pdfIn PDF document text
    • https://koturukumofup.weebly.com/uploads/1/3/4/8/134883222/408956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f92c660df922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fdca50375be2.pdfIn PDF document text
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/b7f62dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_5fafa26b07088.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/8133449e.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/548c86af-de18-4ce2-aa2f-5128ff8c1df2/78419496840.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/kiwamajuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28292b5-1f30-472a-a75d-257b6f028dce/fogafigex.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/75250309508.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 5164 bytes
SHA-256: a3621fc090e8ad899eee2999977e2273bad7173e571913796f60357f568a912e
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10992 bytes
SHA-256: 71b64835e8e61b7711d0450a4adf42ca26cb52d3d26cb270ee22d4b2e7d4eb17

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