Malicious PDF — malware analysis report

Static analysis result for SHA-256 5995b4790b9d9c62…

MALICIOUS

PDF

69.8 KB Created: 2021-02-22 12:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2928021a0fd37114e32be304d61ab316 SHA-1: 1502bb6f798f1cacae66844b495b7014fbc55c64 SHA-256: 5995b4790b9d9c62bfe611b63154cad40b0e02d9e33170524336f6324034a56c
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to a technical manual, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=heat%20and%20mass%20transfer%20cengel%204th%20edition%20pdf%20solution%20manual PDF link annotation
    • https://terokusaf.weebly.com/uploads/1/3/5/3/135347070/defifopa.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/lhaiRo3/fibagetunogobonekajumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_600a496eb6438.pdfIn PDF document text
    • http://dkmz2.club/banner_ads_template_aiv0s4a.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/djijcgj/73325677085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_600deaa046a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5ff1c96338a1d.pdfIn PDF document text
    • http://canonsburglake.org/international_business_strategy_and_the_multinational_companybdhs6.pdfIn PDF document text
    • http://airbin.top/the_man_in_the_high_castle_staffel_4_trailer_german0wwkt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_60170e6622f47.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/fejakixoweka/uc_browser_new_version_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/dapedu.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_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 5620 bytes
SHA-256: bdf8e17be9d58b3c1b53ef48f9903c5001605371e6a54dcf6b5cf20b4e5d26c1
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10300 bytes
SHA-256: ce6f46eeb48916312e9463bbd15b18c022ef40e12cf7237d3c68c4d12cc22cad

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