Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15b664723f0f485…

MALICIOUS

PDF

71.7 KB Created: 2021-02-14 17:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1d092fe50ccd6baf8eca299a83b6f6d7 SHA-1: 6eb97184e9052065bf847d0c596758b09a1a96d3 SHA-256: c15b664723f0f485cd6a22893fd969b4e8e32828f6908b055699820ae53dcdaf
126 Risk Score

Malware Insights

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

The 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 and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a user manual, aligning with phishing tactics.

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://jacksth.ru/wix?keyword=sansa+clip+zip+user+manual PDF link annotation
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/pajoke.pdfIn PDF document text
    • http://matrixbicycles.com/vululometaripoxubcadjv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_5febf0eb31662.pdfIn PDF document text
    • http://meetsoda.pro/769675505240h72g.pdfIn PDF document text
    • http://yogistika.space/8146713129477z3u.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/rjcjien/3429706064.pdfIn PDF document text
    • http://todayshop.website/wupoluvezekunomojymgx.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/wulotaji_vizef_banemenom_roguzewevosega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5fd5fb2a8652d.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/9e3dae63a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fff674ba750f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_5fd6620d679be.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/bajapovogam/nela_ticket_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/leneduwatujefuripojubi.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/41649747751.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/heat_of_formation_worksheet_answers_pogil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 4924 bytes
SHA-256: 064a89e6aeb8601bb4d1fc03df6c5c40e09215ddb88ae4bd3f86c13bbeb60edd
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10440 bytes
SHA-256: ed4571b545e0abe3a3c09d88e06d5f1e43aed9ddf381e33038d4a721a6d05d50
font_02_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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