Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c12f914239b34f…

MALICIOUS

PDF

79.2 KB Created: 2020-11-19 15:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0c1f38d31297d6638ab8ca09843c2d17 SHA-1: 963958dcafd20049cc3002b3bf4e01dd25f18c42 SHA-256: 33c12f914239b34f0251ecd43bf68c027691d18d84499f11fdd180fec4402e9e
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 0.9994

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=christmas+in+dixie+ringtone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fab20b33097f.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/5d3a46056cb368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fac0f467f7d8.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/xifigabamux/adobe_cc_crack_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4a794c-7de6-4357-8e54-d2243deb846b/ruzirubanaguvavukiruni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0febbd-7a39-457e-9663-f95765620104/nuturogofiwazodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff0a1a5-6ff1-4761-86fb-cf47d50135d8/day_trading_and_swing_trading_the_currency_market_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4df92c-f4b6-491f-81f2-e38b6f7142f4/39161592023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94694836-b289-4855-a9b8-d65c4a3dc952/bematalalesozamunobumib.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/65131083093.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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 5088 bytes
SHA-256: 98effa2fc0b788e5a6ab77484f9ff688d7b83078da77d6486201c49746bb3857
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 10736 bytes
SHA-256: cdcb8bcdbd99076ff72815a9f4ef2aa17a592955f15a7b390e6e3d0edfbf0028
font_02_sfnt_off00012277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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