Malicious PDF — malware analysis report

Static analysis result for SHA-256 3583849b08632e3c…

MALICIOUS

PDF

64.1 KB Created: 2020-11-17 15:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38a400e60d196261475d812de47cb6d4 SHA-1: 91e57f176faefb5ac31bb84756994346945cb1ea SHA-256: 3583849b08632e3cfac256f75b6e8a1150e7c03b091e569d411f5f16b7e99b0b
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://trafficel.ru/aws?utm_term=yearly+school+calendar+templates PDF link annotation
    • https://dikefurilixi.weebly.com/uploads/1/3/4/6/134684794/7f33a986dc35771.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/9008238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tugabijenovili/2020_calendar_template_word_starting_monday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a03a087-66cc-4b74-b188-aad7d2c8b792/57094288952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39c17c7-472a-464e-8d37-fad1c400b86c/lujuxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5eeebb-06a7-47a1-8fc4-07fa823a1532/polk_audio_rm705_5.1_home_theater_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f57d100-d91e-4d98-b2c7-67add3b960b3/garfield_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f06abbb-4d86-42e4-8eb6-8686463653f8/51957518906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcfa6fc-0559-4b89-9451-07533e142ed5/doxekexafevunerogedeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8faea5b0-8966-429e-a2cc-b972abbf76f7/26091727523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2380484-fcee-4685-8b7f-6197ae93461e/padizirijirogiti.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/kajamejevagagilekagitut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c33d695-fd0b-40a2-a446-378eaae5d103/kijexa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 5116 bytes
SHA-256: b01b6086b70a0db013a475004428c8aef7b1fcbf77e235a181daf8b1d8d106e4
font_01_sfnt_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 9472 bytes
SHA-256: 63f9600054ce90dc3a91af9afd23d137e7c7f6b46775e2c7f37e8b593e0bdcd0
font_02_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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