Malicious PDF — malware analysis report

Static analysis result for SHA-256 3497f3dd05c9dda8…

MALICIOUS

PDF

69.6 KB Created: 2020-11-30 01:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e73104f5be541034d60350d794d350a0 SHA-1: d34e7f5477bbf800e04a542b798a1b045dfb6a12 SHA-256: 3497f3dd05c9dda8b28e0425c5c9025f09f620e1bc8835c8d56a1481804e4b39
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-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://trafficel.ru/strik?utm_term=mail+charter+net PDF link annotation
    • https://dasitonaz.weebly.com/uploads/1/3/4/3/134379343/edec6c5.pdfIn PDF document text
    • https://vubosetupis.weebly.com/uploads/1/3/4/5/134594606/2151128.pdfIn PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/e858ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_5fa28d436c7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_5fa015613eeb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fc0cc71ecda6.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/pelofupaxoduwit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fa82294ee9f5.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/19662dad-f30d-408c-85be-409ded379459/niriwu.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/gta_chinatown_wars_psp.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/38723954149.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/kinatexomubogopajuxugiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1e3290-a437-45f6-a5f0-04272d327497/94721537043.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/femoral_anteversion_treatment.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_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 4712 bytes
SHA-256: 787b9fca9ec818ded6dc3ec3fb4d35e1b2848fd5cac8dcd79d5fa4d6bf874126
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 2112 bytes
SHA-256: 06bbc0c0d1624784b5076ca7b343e8933da223a86edf6280bdbe5bdf93c1cb63
font_02_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 9952 bytes
SHA-256: 037a6ff08242d3406f32efbb64ea743ad476344a822d5d7bfc8c3d517e747efb

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