Malicious PDF — malware analysis report

Static analysis result for SHA-256 884b72f5b71ea29c…

MALICIOUS

PDF

73.1 KB Created: 2020-12-27 05:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 122ea90d1f8fb789c9347c65d668c17f SHA-1: 790bdb1c7507879f212ef1db2a79818bebacdadc SHA-256: 884b72f5b71ea29c0f2242b015d1b0bd0004618d3417452926f5dea083e97243
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic firings suggest this document is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=intel+processor+pinout In PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/6106331.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/bepizisebotilo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fcb76b641a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f92ede24909b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_5fa7a1a8cbf11.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/rurosaveruk/42124737240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c1334c-195a-4b35-92ba-0c293e717edc/69441623259.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/gugafilakopujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd2eae4-2d26-4c9d-a41a-9ad0b26c3736/sodonopagemadalijekapativ.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/alcatel_1x_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/breakup_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/fuzegojeje.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/hunger_games_chapter_12.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/dental_instruments_study_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 4652 bytes
SHA-256: d09b91362bf208deb290e8ac2d2ee7d3d040ad5012fa02e846ec2190106bcf4e
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11584 bytes
SHA-256: 3b6373f922967fa4b264f0a78c41632cbe8d27c689475b2ea3dc344e09c6697b

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