Malicious PDF — malware analysis report

Static analysis result for SHA-256 d193859b1074040f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 02:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: feaf6ab320c7cea1b755a5ab4ed95a01 SHA-1: 5e27e2c6c54ddb8d194e748ae1bc1e44a19a18b8 SHA-256: d193859b1074040f9012647601985a40874fd347f039d978f2cddbfe37a185ff
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=why+change+actress+in+the+crown PDF link annotation
    • https://cdn.sqhk.co/sunawopi/TIHgchd/versus_the_elite_trials_romance_options.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/zjgiehh/rally_runner_endless_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/wghheA9/sejowupulakejozi.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/jhcgjXa/97147612788.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/jelof.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/dRg4nP5/best_free_open_world_games_for_mac.pdfIn PDF document text
    • http://tobufasir.iblogger.org/branding_style_guide_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/d4MSYQz/dulewubadotuvimiletulik.pdfIn PDF document text
    • https://busiwilepajij.weebly.com/uploads/1/3/4/3/134353274/3499189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_490896acd4c14e3abe4b6048a40989d8.pdf?index=trueIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_422615e4f1b44918bc7407a7204c281f.pdf?index=trueIn PDF document text
    • http://litezopufesox.epizy.com/pijixevulekowaxike.pdfIn PDF document text
    • http://tukemujixoku.rf.gd/palm_reading_guide_short_life_line.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_4a4b738d71ee4a85afffa6ed150443d9.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_b04de4659bb5422a9a5968bbc299d902.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_e389f05af93749d0834f74bb457c847f.pdf?index=trueIn PDF document text
    • http://zozedoxubemox.epizy.com/hunger_games_book_2_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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 5236 bytes
SHA-256: 0d6c7696d76462991c5851a24dffdaf662884f24fc47e9fdb09a864fea1bd309
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 11480 bytes
SHA-256: 680580226f1388ca723d5625409d4234b4a98f8cd85375f3c564c93b272f6d03

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