Malicious PDF — malware analysis report

Static analysis result for SHA-256 1939d484365ea531…

MALICIOUS

PDF

67.4 KB Created: 2020-11-25 20:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3044e64a83f9de9ae9461a3e1cc06126 SHA-1: 315337bbe9867f6d0ce85e1639631c84b6f9c3b9 SHA-256: 1939d484365ea5310e3c9aab5277ddfd055dbef464bed42deebd3d8b9078da98
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of these links, combined with the PDF structure, points towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • 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://traffine.ru/123?utm_term=two+column+proofs+geometry+worksheets PDF link annotation
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/lonamonutisug.pdfIn PDF document text
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/2915671.pdfIn PDF document text
    • https://tasozowi.weebly.com/uploads/1/3/4/3/134315408/5642105.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/sakobidaxu.pdfIn PDF document text
    • https://bivupiduxod.weebly.com/uploads/1/3/4/6/134664268/533e57522f86.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/gemepaxi_kilokif_tobogive_mubez.pdfIn PDF document text
    • https://tijisuxijofijo.weebly.com/uploads/1/3/4/3/134374136/7987192.pdfIn PDF document text
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/ce193d7.pdfIn PDF document text
    • https://xujarilo.weebly.com/uploads/1/3/4/6/134693127/wipaxoz.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/fokedanafodo-vadejepoduzaz.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/3a9b8b31-6870-4a1a-ac63-644bcd0968f7/7460608372.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/vozusalurefanazebikejupa.pdfIn PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/bewanedojovitabibawaxox.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/jimiwujup.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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 5428 bytes
SHA-256: c2bce125b5521fc8de7c715a2ff21c579cd9b3c7573e82d4cf052412d4bd3ea7
font_01_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 11104 bytes
SHA-256: bd538ae584228a631bcf1bcba0b5e1d097b19dd43215b82a276aebf309397fb2

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