Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ac70d9a1d166cf…

MALICIOUS

PDF

76.2 KB Created: 2021-03-10 23:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfbb0032a8bd2738c5c5701a34489c70 SHA-1: 6914b057c26501c17f46269dd9ea2c2d83db476f SHA-256: 14ac70d9a1d166cf9a37175632682e913d336d4d89e4b75a66a39e9e8c26af3a
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure for downloading a PDF related to 'chaff cutter design'. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=chaff+cutter+design+pdf
    • https://cdn.sqhk.co/gabazumad/zhfi2Sq/55441602659.pdf
    • http://vclean-sale.shop/94077802329vndnn.pdf
    • https://cdn.sqhk.co/dagozuwemep/ifibDjc/54276354767.pdf
    • http://brumbum2.xyz/domufivatisalaxetinipmt96j.pdf
    • http://irisca.online/jepogoseb5l5g.pdf
    • https://taxubixud.weebly.com/uploads/1/3/4/7/134760406/4682031.pdf
    • https://cdn-cms.f-static.net/uploads/4426967/normal_601881dc612b1.pdf
    • http://soldonlittleton.com/movawadjcq8o.pdf
    • https://cdn-cms.f-static.net/uploads/4489732/normal_602944fc43c31.pdf
    • https://cdn.sqhk.co/fekigimuzib/cSha9jO/wojef.pdf
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/pafunaropofamu-zadewilowisede-sopitidesupig-pinulub.pdf
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/9018725.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/wimasalapamefipesut.pdf
    • https://cdn.sqhk.co/baluwofuk/cQijggh/44362995022.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajujiju/the_secret_sharer_chapter_summary.pdf
    • http://koravas.rf.gd/design_of_concrete_structures_15th_edition_darwin_solutions_manual.pdf
    • https://s3.amazonaws.com/memobofilenabon/john_deere_510_parts_manual_lawn_mowers.pdf
    • https://s3.amazonaws.com/kizugokofo/menaxumekupuvotagot.pdf
    • http://dokufexazag.epizy.com/61061016009.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef63.bin
73851385e6769f7ce4d5ec7562abf41e660527304bebcf08982000b8c32b239d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 5292 bytes
font_01_sfnt_off0001015d.bin
212a651ec2964af0606fb03eb3c8ed1e3656d1f190d43ccf35bbdf25fdb6c28b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10136 bytes