Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abb5e2fe6ca0e11…

MALICIOUS

PDF

73.0 KB Created: 2021-01-23 06:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4bee42f5a0ce5721f12fa57a7b0c2762 SHA-1: 75d8b2625f91dfefc1215a1de9ff3d4cdac4c3d0 SHA-256: 8abb5e2fe6ca0e1142a13276804a0f690fc3b779607835544a05da5569ed65e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external URIs indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=python+text+to+speech+library PDF link annotation
    • https://cdn.sqhk.co/duxisabaza/31G8MDt/72129067131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_5fe8e68329e90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501041/normal_6002487c0209d.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/ihhNNxe/calendar_2021_january_marathi.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/98f3cec18ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fdab6d04f859.pdfIn PDF document text
    • http://digozulujatozuj.iblogger.org/65749006637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459937/normal_5feb9fac49e57.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/jezobasit/92575420378.pdfIn PDF document text
    • http://joxegav.rf.gd/5920301061.pdfIn PDF document text
    • http://xutarefes.epizy.com/twin_sheet_size_in_cm.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/configurazione_alice_mail_imap_android.pdfIn PDF document text
    • http://sawozepanoludib.rf.gd/beyond_the_sky_into_the_firmament.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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 5332 bytes
SHA-256: 32a3885bdf88083165e4ec3e26ee5c4c72d00fa5c7cc60c0c2ea004138a77dd0
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10244 bytes
SHA-256: 63636c871740d2cf600db336e9c3f997a415e5d3eca729b797efbcb439a5cf4f

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