Malicious PDF — malware analysis report

Static analysis result for SHA-256 890fa81618e8a71f…

MALICIOUS

PDF

77.8 KB Created: 2021-04-04 22:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: c8c7a4f38260272cc2eb41d1359485ee SHA-1: cd178955c414e8c53ee00cda9af47d9918850833 SHA-256: 890fa81618e8a71fb575d3c7ef256cbfa9290e98e31158483c302f773d2edb84
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Animal Farm' which redirects to a suspicious URL. This URL is part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=animal+farm+summary+chapter+1+to+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450439/normal_6057ad5c9ec9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_6066a6ec50303.pdfIn PDF document text
    • http://100naturals.fun/12140041058egunm.pdfIn PDF document text
    • http://begetus11ppz.xyz/54491460106n367c.pdfIn PDF document text
    • http://trickyturkey.com/2010_camaro_ss_front_bumper_removaljty7z.pdfIn PDF document text
    • https://cdn.sqhk.co/tumakakebi/dGJNjJw/napisag.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/SAAEXhd/mr_bowling_ball_arborvitae_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_60362edac41d9.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/jicehiu/37453856984.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/jhiiNgi/43239292266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456391/normal_601cf0f05877d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_37ede20cdba0472887d12e13149e4298.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_ec86442292324494b6fe09c50dbb6fc6.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_a7c9837b89b748f8ac9b3e6048b42a68.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_8c6d516919194c51a494e614c1f9b3a6.pdf?index=trueIn PDF document text
    • http://wugadavax.epizy.com/all_network_codes_apk.pdfIn PDF document text
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_898f8973de734ae686780a813e87dd4d.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_9948a0ee08fc42a8bff9fac078d9804e.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_b4362a2a35b64242827414d0f7d0d00f.pdf?index=trueIn PDF document text
    • http://bitinorakinin.epizy.com/33890850709.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_5fa51edc7c5e40c6a98cba4b53565203.pdf?index=trueIn PDF document text
    • http://lukoleni.epizy.com/crosley_turntable_motor_not_working.pdfIn PDF document text
    • http://pibasas.epizy.com/2d_platformer_game_design_document.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 5488 bytes
SHA-256: 0b031e28a2f4a45d2f74c1c239bfd5569a19b3becd574597543a4a4b5e7af523
font_01_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 10176 bytes
SHA-256: 18b2f17a17ba9b57086a13d0a54bd5c89dbb4e787af920b521f42f16f9f1e9e0

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