Malicious PDF — malware analysis report

Static analysis result for SHA-256 31659451b5709a81…

MALICIOUS

PDF

73.6 KB Created: 2020-11-25 08:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 17a417bcd8dc91b7740dc15a79f7aa0f SHA-1: 0068eff7303d85295d316bf42b231b5fc23f2add SHA-256: 31659451b5709a81540ba2943a579a2bb265eaa0e70043e35ccfe3fc4fdd041a
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://trafffi.ru/123?utm_term=get+lost+in+spanish PDF link annotation
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/2353720.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/fofexijine_duviwirudukol.pdfIn PDF document text
    • https://pudixelive.weebly.com/uploads/1/3/4/7/134733907/jojuzod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fa7add13ed66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fab766b1315c.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/vizopanek.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/6443216.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/tosevud/the_question_mask_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/crafting_guide_guild_wars_2_armorsmith.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/lunafa.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/9759150418.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/camden_county_missouri_cities.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/awdhesh_premi_ke_gana_video_bhojpuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7528b459-c170-47b8-9c23-8127a576f363/88101294554.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 4840 bytes
SHA-256: a82d373dfe0a543e767770e1e3fd92205fbb132ef82a0c53cf03e33b29eba542
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 11980 bytes
SHA-256: 59f82ec3440bd8404fcaa9a6170a6d75920d79691796095bd5659e85fb683eab
font_02_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16068 bytes
SHA-256: bd4ec210b6f0bed3603b49d512cd9a08d3e9d1e81fcf206800274a46106400dd

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