Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d9bbb41b2af64c…

MALICIOUS

PDF

68.9 KB Created: 2020-11-17 09:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9641aac9748fcaf7333abb92c8554eb SHA-1: d6ae5e14d580aa19f33c529ddf42191b4d1374f5 SHA-256: 20d9bbb41b2af64c191f779c6c4efc66ad277dc0ff1cbe2cd081e74f916ccf96
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=a+long+walk+to+water+teacher+guide PDF link annotation
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/a7ed9.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/148f3275-392c-4aea-80ee-99263e402bc4/mitisu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/32478035701.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/cards_against_humanity_uk_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6e6d83-4af7-4104-8cdf-93a754afbacf/xenutapefateloroxetepaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccea3df4-975a-4b3b-85c5-a64f57c000bc/xesofobid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57cce26-c55d-4d4e-967b-a0367cf447f1/nafunogon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c308465f-bb3b-4ec4-b5a8-23046275c902/74632251463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29159ab7-a8c2-4ec1-b921-ecf11110fd4e/zimotilivi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/radian_graphing_calculator_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/voodoo_doll_game_torture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0987412-fb11-4816-bc69-77addff329a2/zobuwebuwit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b49572-9147-42d0-ae43-9a3c8217bc65/82105140245.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/dragoon_rotation_ffxiv_5.1.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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 5168 bytes
SHA-256: e1fc9484bf47d8f55f57313d93b5c57b432627118523e4964feb79c17cfbd52f
font_01_sfnt_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10604 bytes
SHA-256: 33358610d1705a936dec7fa8acfdc5eeeba5bfba49adde43b60050c5955c2536

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