Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35ebe949973bdc6…

MALICIOUS

PDF

76.6 KB Created: 2021-06-01 23:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b3591ead29adc4e3668cb7c3faa4e80 SHA-1: 971155f730f6c514bf482f63ce3a5fea864bb9c6 SHA-256: a35ebe949973bdc68e537c41910eedadc0461c6abca9293aaaad2da97b3d9a73
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with 30 external PDF links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The primary lure appears to be related to 'carrom pool mod apk', directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/pbw?utm_term=carrom+pool+mod+apk+new+version+3.0.1+apk PDF link annotation
    • https://kewesolatuveg.weebly.com/uploads/1/3/1/4/131452958/e2448dbefcf5b83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372087/normal_5fe10ef3ecf97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479718/normal_5ffe0781621e0.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/remizajute-zolepegebiki.pdfIn PDF document text
    • https://sunitago.weebly.com/uploads/1/3/1/8/131856801/mapukasiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_600dc0fdf3154.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451955/normal_60b001b61f499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451744/normal_6007145836fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6048eb2de3428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_600f2154183c8.pdfIn PDF document text
    • https://tumirovuwepilu.weebly.com/uploads/1/3/4/6/134603677/a5686f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd61af7aca7d.pdfIn PDF document text
    • https://nixewoxeb.weebly.com/uploads/1/3/4/3/134354190/9350888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_6000cf8c12a8b.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/03976f57-ca80-4bfd-aaec-3b39062b4faf/out_of_my_mind_sharon_draper_genre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d7aed9-2559-4a45-832d-3c1ff81a5f32/identifying_sentence_fragments_worksheet_page_276_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7873814d-3f56-4f27-8fac-924528ed7e9f/how_to_reset_stopwatch_on_g-shock_5600.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/33415132639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2785070-69c6-4fb7-8541-f4d815027464/68736496028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e25b30-0cac-4b87-9745-0deb80a17f35/best_skyrim_mods_xbox_one_2020_reddit.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/33507649330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112282eb-e8ac-49f4-8a1f-8fc577a9b802/60571601620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68955a8b-ea12-41e3-a3c3-24b215e4acf0/which_coding_should_i_learn_first.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39ba225-39c0-4cae-b35b-7e502bcd13f7/fontself_maker_bundle_for_ps__ai_free_download.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_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 5616 bytes
SHA-256: 416d13b2bd12b9f49ec575b379ac0c7626efb66f0951303d44bc5726be54d9a7
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 10268 bytes
SHA-256: 6ea715634dcc7b741039cc0e978acffa920b821fe46af4b76760aeab7e406794

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