Malicious PDF — malware analysis report

Static analysis result for SHA-256 074a62cd092a0d95…

MALICIOUS

PDF

81.0 KB Created: 2021-02-26 05:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a16926cc08d2455e6d08167f46756218 SHA-1: 9d9ecf4879c165202a1abdb5818d5fb95929056d SHA-256: 074a62cd092a0d95be0f4309766f3dc94cf00aac1aeb7d7c2dbc17073289b55b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing campaigns. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+to+make+brother+printer+discoverable PDF link annotation
    • http://pristav.pro/troy_bilt_push_mower_parts_near_meptkw0.pdfIn PDF document text
    • http://salea.site/22206995058o1jfh.pdfIn PDF document text
    • https://dibetoxiruvon.weebly.com/uploads/1/3/5/4/135400859/2105277.pdfIn PDF document text
    • http://mmuuue.space/movies_near_me_open_christmas_daygzsvm.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/djdjbgd/watch_survival_island_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/e0LEsvx/kobefebalikebabuxatibu.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/igi7hgI/paruzowe.pdfIn PDF document text
    • http://myfoxing.online/69332092129p04hz.pdfIn PDF document text
    • http://cosmostil.top/16765168555opife.pdfIn PDF document text
    • http://coins24h.com/tedodifidgppo.pdfIn PDF document text
    • http://gnoogle.site/gitabozebaxezivetho99h.pdfIn PDF document text
    • https://joxenunufob.weebly.com/uploads/1/3/1/6/131606789/ximaseta_vopukub_jefadezomite_fevoxovolomigi.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/jbucdig/castle_miner_z_free_download_pc.pdfIn PDF document text
    • http://littlenat.space/air_baltic_flight_information3gnsf.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/momuditi.pdfIn PDF document text
    • http://redpandarecycling.com/dfo_best_classf5aqr.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/VhaeCUp/live_cricket_score_world_cup_2019_video_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/gzfiiBb/tubemate_2018_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/RJ8bNs8/90253903539.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/3073091.pdfIn PDF document text
    • http://bigops.fun/how_to_do_proper_istikharahye24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 5628 bytes
SHA-256: 4fde95460d474179826d84b56d65d68961d918f5643cce454c02f374d3349f54
font_01_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 10132 bytes
SHA-256: 2f7f448d683d70534aeeed9e706edf4bfce24117b00a39380ac7861ff7d891d7

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