Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13c6d7a43c3d227…

MALICIOUS

PDF

79.1 KB Created: 2021-01-29 15:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d0c308a726a7146c7fc2db4338fee45 SHA-1: 259e6bf88ee2f2a89e2565a4bcf89ac3f11022f0 SHA-256: f13c6d7a43c3d227bc8af83b3d5f5d6c566dd8b5aef12dccb139a5d334b58655
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=poe+arc+hierophant+guide PDF link annotation
    • http://fashion-deals.xyz/dinosaurs_cards_dino_game_hacku631t.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/fe78f8730a.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/77e488981.pdfIn PDF document text
    • http://avbox.org/52474259933vk8gn.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/kuwunizogetafed.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/jaiidja/macos_podcast_downloader.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/fkgjijh/wavir.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/6495756.pdfIn PDF document text
    • http://fortysgjdk.fun/military_college_murree_admission_fo78i95.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/yhagh8I/46759951545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosimamasi.epizy.com/kadamban_movie_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/pottery_barn_baby_boy_crib_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/difference_between_elastic_and_inelastic_demand.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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 5124 bytes
SHA-256: 981a2e97f1bac2aa0eaaa1010eb4042c8b1afcbbbea516155a9b65027b576560
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10824 bytes
SHA-256: 9763a03f3128661797f4a3bb3c048b961b0fd3ac2071805fd257a8f5b1b3fa6e

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