Malicious PDF — malware analysis report

Static analysis result for SHA-256 531a17d1ec1fbcea…

MALICIOUS

PDF

103.4 KB Created: 2021-03-14 10:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c5f69d88744b9e8fab369a61a7c17162 SHA-1: 81ff8f746afce5a6543528d381795693949dc4a2 SHA-256: 531a17d1ec1fbcea7e649136b399c6aff21c69435ee4d61779abe9a8acfafbc8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/strik?utm_term=concept+of+radicalism+theory PDF link annotation
    • https://sedifuwenute.weebly.com/uploads/1/3/4/4/134464273/9bbda1f.pdfIn PDF document text
    • http://car-den.ru/tibijefenfe4s.pdfIn PDF document text
    • http://item-get.top/q6f_refresh_ratew4ovy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411273/normal_5ff7a39020e63.pdfIn PDF document text
    • http://reawolt.online/lodalupilemhj0qb.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/prgfpgB/customizable_stickers_in_bulk.pdfIn PDF document text
    • http://stavki-na-sport.site/someone_like_you_van_morrison_chords_pianoh92sx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_603a215ea1a64.pdfIn PDF document text
    • http://www19216801.site/lorefuponofeme0n002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448536/normal_5fe604cf403c4.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/gFISidy/9313086527.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/ef3965f38cc.pdfIn PDF document text
    • https://rumodabumuxe.weebly.com/uploads/1/3/1/8/131857513/vulipido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_601cde8a73214.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/iid8iia/bsnl_mobile_recharge_offers_today.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/nabifovu/morubizis.pdfIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_a85b427523f34012bca8a6ff70a1b2cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/8296378.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/stephen_king_movies_ranked_imdb.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_2f1fe8e839f547a2bbad4d435148fc4a.pdf?index=trueIn 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_off00014a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A92 5308 bytes
SHA-256: 97d3c5da6a004708e74fb3884ad930af8de6868d08c22e0dd8e0f899bb29f6fe
font_01_sfnt_off00015c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C72 11300 bytes
SHA-256: 93258ce67f95533fa700c076d3ffd3beaa20a8055c1fbd9b317b78a8e46f4986
font_02_sfnt_off0001823a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1823A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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