Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff56242b8d35d20b…

MALICIOUS

PDF

92.1 KB Created: 2021-04-02 18:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e3e00f8ae1d1e4feccb42c85b9d2bbd4 SHA-1: cd609fd91018a6bfec6e59d090f3b361a6f891ba SHA-256: ff56242b8d35d20bc7c884b8ae3a0993f5dac17b494779ffdc5a026225827361
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs that point to other PDF documents. The primary malicious activity appears to be directing users to these external links, which could lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=applied+business+statistics+by+trevor+wegner+3rd+edition+pdf+free+download PDF link annotation
    • http://kavademive.sportsontheweb.net/colt_ar_15_ammo_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_602ba95290ba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fe288e278a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_6035472a334f5.pdfIn PDF document text
    • http://pizixaranifasof.iblogger.org/marcelo_quiroga_santa_cruz_biografia.pdfIn PDF document text
    • https://didukomam.weebly.com/uploads/1/3/1/8/131857465/5710429.pdfIn PDF document text
    • https://biwusegunaji.weebly.com/uploads/1/3/4/0/134096831/juxuwisop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_5fc967332d931.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/potijuzakufa.pdfIn PDF document text
    • https://xixolediz.weebly.com/uploads/1/3/4/5/134513169/277743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_6042da8294c9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_e0f8385d6c48496f9c671ae10ebc5eb7.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_e32cbf355dcb4dd5b8a30d53171caef6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozuga/13598182755.pdfIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_80a0510fe58f42659d7e813cc21513bd.pdf?index=trueIn PDF document text
    • http://bapejilujuzegu.rf.gd/itil_service_catalogue_template_free.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/adenomyosis_uteri.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_720719d082e04e81b8c9730242a3bb11.pdf?index=trueIn PDF document text
    • http://ziwemasux.myartsonline.com/part_time_sales_manager_jobs_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/32774463616.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/25042961706.pdfIn PDF document text
    • http://situwosase.myartsonline.com/64108265507.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/happy_birthday_song_animated_video_free.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_off000124af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 5872 bytes
SHA-256: af822c67ad8b7388042983d67e5ef042a4ac91f42a00bc8e9c2c7918e6ed65b1
font_01_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 12176 bytes
SHA-256: 659bfc9936687537f784b1fd59684a3cacf4b27d6057f53eb4f47ff12d799c5c