Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f67eb6b25a82d5…

MALICIOUS

PDF

73.3 KB Created: 2020-12-23 01:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dface937ab19dc3e55558c64ce0cf793 SHA-1: 1abe2ac61ab1f6c332960d15c1ed05228db325df SHA-256: f4f67eb6b25a82d5855cdbe7989db7655c153723b1007588906d8a402f7839c5
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Anti corruption act malaysia' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent.

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://trafffe.ru/aws?utm_term=anti+corruption+act+malaysia+pdf
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5fdb60617fc68.pdf
    • https://cdn-cms.f-static.net/uploads/4423714/normal_5fae1130f0a5a.pdf
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fcc316668240.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/gejasu.pdf
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/2cb5005ce.pdf
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f923bc020dc1.pdf
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5fc170ded34c6.pdf
    • https://mabedokuk.weebly.com/uploads/1/3/4/5/134582143/fajas.pdf
    • https://cdn-cms.f-static.net/uploads/4498994/normal_5fb8dafc030a4.pdf
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/3785898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3171a43e-6753-4405-9ea2-bc135b41dbf6/sword_art_online_ordinal_scale_mp4.pdf
    • https://uploads.strikinglycdn.com/files/aeb4959f-2d14-4678-84e2-bad5b698b35e/forge_of_empires_apk.pdf
    • https://uploads.strikinglycdn.com/files/a675f019-1977-41c0-a5f1-1228519c68bb/luzesi.pdf
    • https://uploads.strikinglycdn.com/files/882884ed-61ae-4636-856e-caad246218f1/lion_king_cover_secret.pdf
    • https://uploads.strikinglycdn.com/files/adde983a-4127-45f8-8a24-4d899e3979e2/bupugenupoza.pdf
    • https://uploads.strikinglycdn.com/files/ac0876a3-a98d-4ff7-930b-6bc19ea58225/ravenel_elementary_school_supply_list.pdf
    • https://uploads.strikinglycdn.com/files/5fbdf297-d0b9-4d59-8962-4d270a22ac9d/parajonesukevoro.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_off0000e12c.bin
c76961b4b1647a284c8f807afe291fb2f09a79912ac917655e9e29cd09b5226a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 5392 bytes
font_01_sfnt_off0000f377.bin
324498c1eef4e0ff173b2cc90c9e7e5e197c0a95352be4e8889db52dc355254a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 10776 bytes