Malicious PDF — malware analysis report

Static analysis result for SHA-256 9633042990e57b93…

MALICIOUS

PDF

77.6 KB Created: 2021-05-17 20:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99fe317ba9c500664a7d33aeb28db83a SHA-1: cf43f1cb3b2ace72e045de2e194fbd80e4ae5cd6 SHA-256: 9633042990e57b93a0d7cb6fdc7b17d0150ebab1ca48d6b40c15413847265a92
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL suggesting a lure related to 'garbage disposal manual'. While no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=badger+100-1+garbage+disposal+manual PDF link annotation
    • https://cdn.sqhk.co/josipinu/ehgiYid/29262476914.pdfIn PDF document text
    • https://cdn.sqhk.co/palubavuz/LDhefig/turbo_card_balance_number.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/aOagi1P/wilomoribejeleveguvonuza.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jhcM7OT/piwufat.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/3863378.pdfIn PDF document text
    • https://tadizusojad.weebly.com/uploads/1/3/2/7/132712436/zekigo.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/jjmrQxm/negezesewiv.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/haiijcc/bouncy_slime_impossible_game.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/iprGijz/guess_the_word_offline_games_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/dMPhgcR/individualized_student_learning_plan_template.pdfIn PDF document text
    • https://mabedokuk.weebly.com/uploads/1/3/4/5/134582143/denuburokujexa-nelinulorigos.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/ff650d4f-703d-46a8-b603-baf42a196f8a/takemuzojanukuduwagozuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/mixutoriwitojog.pdfIn PDF document text
    • http://fudakudawape.rf.gd/43112005777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205cda55-c858-43d5-8005-15ce28a360e4/what_do_the_chrysanthemums_represent_in_the_chrysanthemums.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/android_phone_comparison_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/71336657768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd820319-b6a5-4153-870a-af3e91faf234/sogewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91d4897-28d2-4d56-8229-579f898f02ad/bepokulurululufejabiwudi.pdfIn PDF document text
    • http://natixiluv.rf.gd/novo_portugues_sem_fronteiras_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f206c43-acda-4be0-94f1-e4cb683bc9fa/philips_norelco_series_5000_trimmer_attachments.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5696 bytes
SHA-256: 07f04034791508b0ba1a171e520a017d9a14905d0bf71ff2c600dbd6c7974af9
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 10700 bytes
SHA-256: 77eb3a00aa13499eb88874089bdf1a5c5a9470de50e0849ef216764dd1be2b42