Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1222bd6783ceb0…

MALICIOUS

PDF

73.5 KB Created: 2021-02-07 08:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 484fc214f994408bbd290d297439d65e SHA-1: 6f50c3d1edd7f6d2bf56802622087249fe6df27b SHA-256: 9d1222bd6783ceb0696a2819e6312c9005cb69eb5fd48372f483300f4be1b0a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/aws?utm_term=shalom+aleichem+violin+sheet+music PDF link annotation
    • https://cdn.sqhk.co/mavixuwaloz/kJ6ihme/femukuseduvivirenim.pdfIn PDF document text
    • http://bigswinner.space/baby_g_shock_manual_5338t0vge.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/rhjOgcm/fobijifux.pdfIn PDF document text
    • https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/5250576.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/1962364.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/dezowobego-tejefug-dolipob-zokaju.pdfIn PDF document text
    • http://zefedupawomodos.22web.org/97167339538.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/perurulexi/nuwutasenoguses.pdfIn PDF document text
    • http://jibavorom.rf.gd/assamese_new_all_song_2018.pdfIn PDF document text
    • http://bovumemudij.rf.gd/wadedabub.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/77843681566.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/angular8_template_reference_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/kambikuttan_malayalam_cartoon.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_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 5104 bytes
SHA-256: 42559648304a859d918c2f8e66f0833b53e4924f6cd494a2f4f2eb6c98103c4b
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 10940 bytes
SHA-256: 1337c69dca79c6413c76133e489cb065f15657afe2e9e065921ccd8a06b76ccb
font_02_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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