Malicious PDF — malware analysis report

Static analysis result for SHA-256 f991ccefab00c04d…

MALICIOUS

PDF

77.9 KB Created: 2021-05-20 17:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6ab6d23ee40a8a5f553a14044282ae7e SHA-1: 3e5dffa32a71703119a3b177b4d8225577494bc9 SHA-256: f991ccefab00c04d7b724abf897dda4c92465eb5892bee40319dbc3bcd91e4a9
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous external links, including one disguised as a download for 'Need for Speed Underground 2 APK'. The PDF employs a link farm strategy to distribute traffic across multiple disposable hosting sites, aiming to obscure the ultimate malicious destination. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=need+for+speed+underground+2+apk+%252B+data+download+for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5ff12cbd0f7d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_602783c1dc910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5fe74fdb7a3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_60233d6dd07ae.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/7d7fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_606de07710c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_60652b03d5fd7.pdfIn PDF document text
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/vepowafaxif_jesimomibidab_zavipamofana.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/375bb89faac4.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/lonojebipiso.pdfIn PDF document text
    • https://fokomawirofuteb.weebly.com/uploads/1/3/0/9/130969657/ruvobufalovelon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_60469457c8923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_601af7a6cefaf.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/naxawa_kubosujut.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/fiwavijovisam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_601dc668b3d88.pdfIn PDF document text
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/fonuvilopapusijedip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_603f228e32673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fd86635f0b32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423453/normal_5ff195a69a08f.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/mevuzokekenojab/what_does_this_word_mean_because.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/full_form_of_mla_in_marathi.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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 5464 bytes
SHA-256: aa687b5af70da7aa20d6f7ec3f0339608b7e1f57c285a77ff3fa425d3d5717be
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10656 bytes
SHA-256: 814b0a8e56074b811a533fa2982970e7454d1f83fd02ae32d269cfdb89858a32

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