Malicious PDF — malware analysis report

Static analysis result for SHA-256 02db9eba98d9989f…

MALICIOUS

PDF

69.6 KB Created: 2021-03-28 01:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d73f48ff59e080a07d4eea447000ac15 SHA-1: 81b438ca422ee948e9dbae755157580413d77297 SHA-256: 02db9eba98d9989f735330dd2577c41f74dcb7de46142aec7f656c44ed339b5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/strik?utm_term=apostrophe+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448096/normal_6041c1044c732.pdfIn PDF document text
    • http://roman-holidays.shop/velenugoripsj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6057e19c1d73c.pdfIn PDF document text
    • http://damvglaz6.xyz/centricity_business_manual2e3dq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_c41da3975e31408d8712d76089a5c9ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/92949054006.pdfIn PDF document text
    • http://jipinasin.epizy.com/50651785859.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_a264c78cb38442968f33c623d8e4d955.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/gun_digest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39e2cfe-3f48-46e1-84a1-23c25d3ed95f/ponniyin_selvan_english.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_4e3d8a836b1d4676a14108fc1497c9e8.pdf?index=trueIn PDF document text
    • http://semewefiji.rf.gd/callus_formation_after_a_fracture.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/hatsun_agro_annual_report.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_e22ec726b4dd41708ff6ed52effb8ab0.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_72da4609b47e46648f0e38b335dcbbb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ae6d3b-c4ac-4e78-8633-617f261d1dfb/runatutozalefisilag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcec01cb-44d9-4bf5-b3b4-9b7ac2b6922c/lonoteser.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_off0000d47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47F 5060 bytes
SHA-256: b79285ff34480425c23a637851af8d5e37f9cd84410378c19156bd122ddcc1a4
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10508 bytes
SHA-256: 9e0b3066aed99981dffcea25d5ae136840aaa36097d69b3e9c0b1fbbac5dc6cf

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