Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cef6f9780c0994…

MALICIOUS

PDF

75.8 KB Created: 2021-05-17 02:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6c6f8f0eead596229d310aaea0b24783 SHA-1: e532d7416868a970bded1a8f6905c1af235620ed SHA-256: 97cef6f9780c0994d52bd8ad7d603c6c6e555eb842fee29feeb367a9c2207bb7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and identified as part of a link farm. This suggests a malicious intent to manipulate search engine rankings or direct users to potentially harmful content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=line+6+spider+ii+120w+2x10+review PDF link annotation
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/bowowozasifirajukewu.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/xipuviko.pdfIn PDF document text
    • https://zajutarox.weebly.com/uploads/1/3/0/8/130814803/xevuxi.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/vuxupikerew.pdfIn PDF document text
    • http://eurozone.pro/juwusese3948n.pdfIn PDF document text
    • http://robolab.one/zigozp9js5.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/f6c61813d2b63.pdfIn PDF document text
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/094e587357a.pdfIn PDF document text
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/38204a0b2a.pdfIn PDF document text
    • http://zubiki.top/onan_diesel_generator_service_manualu3s4i.pdfIn PDF document text
    • http://sodahub.pro/35390806810xvkd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7de02e-7fcf-4e90-bd86-117f01017d79/whirlpool_washing_machine_top_loader_manual.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_a7728c6f348d4ca8b0ce15d8a5a30ea7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfd00a1-9b00-47e0-b6fb-862675986e25/samsung_galaxy_note_4_cases_and_covers.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/78394209144.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/kshatriya_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d68e47a-aef2-4994-8934-0b5879523690/rokinigesek.pdfIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_08b92af3d7014ca5a155ab7c857de62e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/75576400157.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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 5352 bytes
SHA-256: b032974d62742fbf43d6bf3c877b6b96357cf07fbe9821531b9554148767e2ea
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 10808 bytes
SHA-256: 604780d1c697be1035248237b352a33f14a8f4a36817241c03b585a660074944