Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54c1a72f7f2f4aa…

MALICIOUS

PDF

82.8 KB Created: 2021-02-13 01:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e70f59d96e296c243a6b9b6c8d3b17f4 SHA-1: 64756387a6b247ba501ee9794366af2e36ac8609 SHA-256: a54c1a72f7f2f4aacbea09088e7d2d400475bddffa30906b5b3045ce8db6aa81
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The embedded URLs and the document's structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wb?keyword=air%20france%20klm%20annual%20report%202015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488570/normal_5fe7a2582bc34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fff42be6a032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_601950be7dc55.pdfIn PDF document text
    • https://lurafavef.weebly.com/uploads/1/3/0/8/130813461/222325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602264c4a6bb6.pdfIn PDF document text
    • https://nipapisowoxodo.weebly.com/uploads/1/3/5/3/135349464/3001914.pdfIn PDF document text
    • http://klosheff.xyz/minecraft_lite_download_free_pcpn85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_601518be2fb7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5fe74fcfa44d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_60225a930b672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fca8614d16a7.pdfIn PDF document text
    • http://organic100.fun/harlem_shake_poopxmdr4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5fcc5d773861b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_6014222340b5f.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/dcf51f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_601c0529d3cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_5fe880b840f86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff0dcab45b01.pdfIn PDF document text
    • http://proba7.xyz/balcony_scene_romeo_and_juliet_sheet_music2iphc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_60049c0793db7.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/12212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bejideba/zovudodibedogojabusomigev.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/aci_concrete_mix_design_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/dejidesabukasuw.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_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 5368 bytes
SHA-256: 5bd8e76f39d53a1babebac744e0c592b084f460b4237c6274eaff81d943a6978
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 11408 bytes
SHA-256: 8f1b741e671d6521eda1f4a1aa4a8e4f065a7d7fc085d0a5d885c1c2fddd5595
font_02_sfnt_off00012f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71