Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa4aa9f5945c7d…

MALICIOUS

PDF

73.6 KB Created: 2020-11-17 08:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a856b47c55094aaca7a70d80893d4c9e SHA-1: 27c539b9ac54f1588e3b0fef8f94884f28b570d9 SHA-256: 0bfa4aa9f5945c7dc26281ef9fac0ec4dbba2353c485309f611717969097a7f1
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://traffine.ru/123?utm_term=50m+sq+to+feet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5f9b98fe501eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5f969c9373475.pdfIn PDF document text
    • https://saxoxukodumixab.weebly.com/uploads/1/3/4/6/134635675/1403641.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f944ac182189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_5fad4e660361b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5fa83052a05d8.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/tusog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/99650094341.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/danadogug.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/2020_eye_venue_westminster_co.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/asc_605_35.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/delete_nook_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/dokkan_battle_modded_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/17793961639.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/53295025774.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/girikutemamexumuxivifabo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 4872 bytes
SHA-256: d16e24553a1072a2abf2d1ccf004b67cba71e2ce5f9756c213bdc2a1e87a6a2a
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10200 bytes
SHA-256: 5d5ffc4bbd3344b0f214107f974da9eb9d3d56e0b99d572f785bcc424318f3c3
font_02_sfnt_off000102e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E3 16216 bytes
SHA-256: 9aaf374d64521945a2d179b3de22a0ad451813c1e8d23897d9514ef9876b453b

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