Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc79888578ce02dc…

MALICIOUS

PDF

131.6 KB Created: 2020-11-22 05:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0bad3c796b37b5e6f2e65cff3bc2da1d SHA-1: 9a93a9465f42215a9f0b0ac777a2658ae490ae23 SHA-256: dc79888578ce02dce254684d56e41a65c9feb3f19058e0bfbcff2ce050298693
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating an attempt to host numerous external links. One of these links, 'https://trafffe.ru/123?utm_term=click+clack+the+rattlebag', is flagged as suspicious and likely serves as the primary lure. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=click+clack+the+rattlebag PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fa2b9dcf3889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5fb42aec1db70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f90cfaf12bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f8cb1120722e.pdfIn PDF document text
    • https://gigomafokat.weebly.com/uploads/1/3/4/7/134717504/vasagamogin_vasidexigoxej_fabowoborij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_5fa216d8af370.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/222d8b4a-abec-466e-a93a-9765e033e121/bezisewabolerepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafbe3f3-8569-4e76-9397-35e9842968b2/63506560454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806d85b3-20c6-4030-8bee-355e69ee3441/pps_public_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/the_flash_movie_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccb47e9-bbe1-4e3c-aeca-61dedb6434cd/tipojiriz.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/cameroon_visa_application_form.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_off0001ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCEC 4992 bytes
SHA-256: 7f5266a080d3f69f207bc76fbcb48929439c78ad39691c9f3ffe376ce888f4ca
font_01_sfnt_off0001dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDE4 10312 bytes
SHA-256: ea560d670ad96dc5035c3ce2a89b8b938439dc0fc6523cda2495ffaf0d2f42da

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