Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5398677e1e86ef…

MALICIOUS

PDF

73.9 KB Created: 2021-03-28 21:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87664a7d5216b8b230f0a985e0e3952b SHA-1: 11e23a3ee3dc40552dfa15b55c32a90d2b3b6442 SHA-256: ba5398677e1e86effbaa19792808a058d8cb409e66ff851d32d6ce2f9e6057c7
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or malware delivery.

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 http://kapovulup.mywebcommunity.org/89923782954.pdf In PDF document text
    • http://gebikomuxe.getenjoyment.net/yasin_dalam_rumi.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/561720445.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/gujarati_bhajan_free_download.pdfIn PDF document text
    • http://onlinesos.tech/nabagefinpus4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_601c00610b8e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_6060ad2dca2a3.pdfIn PDF document text
    • http://spoonnumberone.xyz/gesalewodefatebusulejixoox1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=the%20endocrine%20system%20consists%20of%20blank%20that%20secrete%20blank%20into%20the%20bloodstreamPDF link annotation
    • http://forojiwimudobo.atwebpages.com/on_the_reproduction_of_capitalism_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7eac244-2559-4cf3-a77b-722370d84892/64167923667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a86691-39bb-48b2-873a-490fa3c8aa64/how_to_use_acrobat_pro_dc_helpx.pdfIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_9266eb8d20e846519c4ec22184a90736.pdf?index=trueIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_398f2f688758404a80e19db1594dc947.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_7e0276a7dd874995bfbf3d7ec660446f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7456d46b-4a31-4d04-b6bb-f9556ce31203/rezabubasodakumifajubopel.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5516 bytes
SHA-256: 054ae503a93c884fe36c47c20aa23115bb788a8a1169ea840f3c39f035ba0a71
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10084 bytes
SHA-256: 2a6be8e9940f9230309dd0b328e326d0a587cb2783f4b25937282ea47bc9c5a9

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