Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5fd676e50a571d…

MALICIOUS

PDF

88.4 KB Created: 2021-03-18 11:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b4048c5859dae760da0d73b837dd2be8 SHA-1: 1c0b4a4e04ad01bc68c51a57a7e6ada6f3c82b10 SHA-256: de5fd676e50a571dad1355ff53352319dfe48963faa0d75377fb7da67f5a5906
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, flagged as a link farm and potentially disposable hosting, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/wix?keyword=how+to+calibrate+iphone+touch+screen PDF link annotation
    • https://cdn.sqhk.co/jenireni/MhfDCYb/car_racing_games_for_pc_2gb_ram.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/geVFeo1/world_war_z_2_game_trailer.pdfIn PDF document text
    • https://tojawejememu.weebly.com/uploads/1/3/2/6/132682640/vexesizotaved-rosusotelopu-zifunixinudanaz-fuzixipu.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/8831622.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/gMmx7jc/gobeluvoxozomif.pdfIn PDF document text
    • https://pejolufuti.weebly.com/uploads/1/3/4/0/134018137/8475872.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/jgzlYWt/virtual_dj_sampler_effects_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ihgdqjb/34235666062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_7beec73c4edf409f81f2fe969aac1237.pdf?index=trueIn PDF document text
    • http://zijisulejemam.rf.gd/68763162055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a511d1b6-ac73-44e9-b0ae-0d1d32c95dd1/10356438017.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_b9366cff3d284a1d8d7202497fc880f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af224a5b-daf8-45ad-9872-631481a6c5f6/what_is_heat_exchanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acfe543a-fef0-4359-996a-041b4b829a97/brother_pt_h100lb.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_071b17e6ce4a4ef89295784b15fd1a81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/932a02c3-76ec-4a04-9f3f-39c3e03067e6/juboramalukimiridoz.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/vmware_horizon_view_deployment_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4577e8-e3e4-4b77-a00d-1b3ee6a581e2/45475392255.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_bfc4fbf37930415784737c6b0c3e8da8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c2d936-1a2e-49a9-8b2c-697fd9c5ba81/84851558923.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_5514948c24f0477c97cf8ce820c3e00b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ef5e91-95fe-424e-b575-19869349377d/polk_audio_surroundbar_4000_bluetooth_pairing.pdfIn PDF document text
    • http://nejotuwusa.rf.gd/wukuzilumuvumibojun.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 5212 bytes
SHA-256: 187ce3c52b22a4afe466b9d80f2e071319cebe5015020255f6f63a136e9c508a
font_01_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 10964 bytes
SHA-256: 09889f7ffd00127d44e5a525a45205c276441f35dc0dcf9d5b610765a8822068
font_02_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16300 bytes
SHA-256: e4fbeb38030c3769964c1a5951c533a55f21893d08e7f16e9b1af1c698f23ca6