Malicious PDF — malware analysis report

Static analysis result for SHA-256 285c164303549ecd…

MALICIOUS

PDF

84.4 KB Created: 2021-03-14 14:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a47849d5b4e04a40e640ef0f6496282d SHA-1: 07ecdb91e7a0de4e8ceda9a5b301a183cac7ba17 SHA-256: 285c164303549ecd0de7e949df0792bf0c9dc2353ad68fd47dda9e8a8021c91c
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 of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for phishing or malware distribution.

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://ponafet.ru/strik?utm_term=what+are+the+phases+of+software+testing+life+cycle PDF link annotation
    • https://cdn.sqhk.co/zalopubid/tjeVrFn/angry_birds_pc_mod_apk.pdfIn PDF document text
    • http://hdsamara.ru/79948460299xhlgy.pdfIn PDF document text
    • https://sivanijizifi.weebly.com/uploads/1/3/4/8/134848714/godiriva.pdfIn PDF document text
    • http://furniture21.online/soradalakigutn2x5z.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/j8HPydr/harmony_isle_update.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/gWtjrYI/ice_climbers_game_boy.pdfIn PDF document text
    • https://gozerivolese.weebly.com/uploads/1/3/4/2/134265833/4709129.pdfIn PDF document text
    • http://circulyarkadigital.xyz/sugemawurodeleskh7.pdfIn PDF document text
    • http://hookup157.online/how_to_address_a_female_doctor_in_spanishrnvkv.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/yard_machine_riding_lawn_mower_starterm402v.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/dqfxvIf/3314248087.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/09ef67a8382c9.pdfIn PDF document text
    • http://opit.space/siwoveruzijubesbcpw.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/5559324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_ce18c7f5a327480490db933a6aab8dbd.pdf?index=trueIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_eda70290b4d040b7971ba60ae962184d.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_0b510ba7c4f646d5a6be084cb09d1ee5.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_2451a55546934a2d87f64f2a31198bfa.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_bfd336f3d6ef4213b275b92e4fc602ed.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_bdcda6eda2564d2ea72ed4e693c5bdf2.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_12ee7b674b9a4dff9390fe5e76f1c670.pdf?index=trueIn 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_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 5484 bytes
SHA-256: 8519f171f89d1f770fac5145b4a900b91854a08fb36b64dbbfd8c6a9e67dbb35
font_01_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 11192 bytes
SHA-256: 790ac2fb1da76ffe50cb941afe66676a40b97dbf3c07c4b8d737bc81caf8da18