Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd81896b283d5f94…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 08:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71c24d0e6f925fdee4a3b93f5b1826f5 SHA-1: 7be36ce84106eb9bc3654123d28caad3d536f6b4 SHA-256: cd81896b283d5f94c742f1d3458e9dbf96a6339b042caa77aa038bfce3e2fc35
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=games+for+business+english+pdf
    • http://filmera.ru/65984982167shwk4.pdf
    • https://cdn.sqhk.co/pujixefan/jfcbLjf/dungeon_keeper_2_walkthrough_level_19.pdf
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/9859274.pdf
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/mijarowad.pdf
    • http://bodipok.getenjoyment.net/juvofer.pdf
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/govikov.pdf
    • http://vsedlyatebya.xyz/77124378940hffnm.pdf
    • http://kuzamejeluwezik.22web.org/invitation_templates_microsoft_word.pdf
    • https://cdn.sqhk.co/kuxixixixi/f3hjHNx/3_column_brochure_template_word.pdf
    • https://cdn.sqhk.co/tewokozogop/Mjazggc/neon_color_ball_road_run_play_online.pdf
    • https://zasipirowi.weebly.com/uploads/1/3/4/2/134266189/6487617.pdf
    • http://lizowaw.scienceontheweb.net/zamiwinipunoxov.pdf
    • http://zomaragexavope.sportsontheweb.net/asterix_legionario_italiano.pdf
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/581745e17591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_2c762b1466544d098ac1bdee81944398.pdf?index=true
    • http://difugarulid.epizy.com/xirozu.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_928248c204224cc58a740d0e39a7ec00.pdf?index=true
    • http://juxenemijoguku.rf.gd/87640851272.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_11fc2141e9674e1db77b836c791e3c98.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_60a81ab439dd4ce6b577241bea5c1644.pdf?index=true
    • http://vusubugoziw.epizy.com/13972487905.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbb.bin
c22b3046bc5b68fe3c95d85bdbef39cd982d6c25adb4ab2c824ddc56ee482e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 5624 bytes
font_01_sfnt_off00010fab.bin
8656259d9856dd19c9f9ebf8738813ba011b20807449cf9fb58e0093bae6eda6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10452 bytes

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