Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c98430468bad137…

MALICIOUS

PDF

70.5 KB Created: 2021-04-30 07:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 929850d54d1db8955a1343ec5aca016d SHA-1: 400430ba3a27110b4fdf784474e00832fd1a148c SHA-256: 2c98430468bad1374b8677583a01ff9e5464fca761b914901db2ba166a1c66eb
186 Risk Score

Malware Insights

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

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 0.9959

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://kuzutuzo.ru/strik?utm_term=matlab+deep+learning+with+machine+learning+neural+networks+and+artificial PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fdd2fa409684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_60100387df624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5fed97aeb79c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_602f7db96ff9d.pdfIn PDF document text
    • http://tricitysikhs.com/gowelokidewzety.pdfIn PDF document text
    • http://accueilcmb.com/79509834301dd1ur.pdfIn PDF document text
    • http://itawegan.fun/canadian_business_investor_s_guide_2019syvd1.pdfIn PDF document text
    • http://garderob-podolsk.ru/xigobiwukuxemizuxemozakublms36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_603ba6cbb8bf0.pdfIn PDF document text
    • http://1offpark.xyz/37287889707xdfz7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/ilo_tv_manufacturer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a168302-e78d-4a07-b200-911f56ed449d/woraxososoxowowamedavaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9280d0ff-3257-46df-b6df-a1de56a0f1ae/jugedazujajisalurul.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/ratubige.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/zamokazapol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8562b09-6cae-478a-bc09-d9061ca2d822/how_to_work_out_compound_shapes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7752726-6d15-44c7-acf1-2430a5a4ae80/toweraguliwojufijenak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca00c9ae-7c58-4cb8-90e4-16a657834af9/cathy_caruth_trauma.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_47eeedd6ab294845ad8675f7b7a67eaa.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_319591b47076428188f051f688f4f09e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10249de-b20f-4205-b039-7ddc7ee03c64/beretta_a300_full_choke_steel_shot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119d2db6-bf4f-4586-a417-9c6b9e5adec7/dedaderujupalilelenigilot.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/3935539842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3a556d-90f8-411e-ba18-c934b5fa979f/bhagavad_gita_chapter_2_verse_54_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/67756444438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c2aced-eaf1-4605-a50c-b9e0368cc165/writing_performance_evaluation_reports.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_4d20622dfc4d47ae9de304eb1fddf9a6.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_2fd8cbdae7da4e2fb659b89e7c5bb659.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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 5872 bytes
SHA-256: 83405a85c09e17866d54c14259906d2ca07ec19ba385d40f98e98a16e2d9b0e6
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 9712 bytes
SHA-256: 345d59e1b34d5aa8fe564877926202d9371e512c864fb6a289884e4281c73735