Malicious PDF — malware analysis report

Static analysis result for SHA-256 91faf1faee127d56…

MALICIOUS

PDF

79.7 KB Created: 2021-04-13 10:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44d371c477fdbbc5ca7645590f9579c1 SHA-1: 5f7ea404e6ae2d3d31ca6cb77c01dde3d8a45336 SHA-256: 91faf1faee127d56535637bae74d50fa06b9c0fe4e2ffcd3712561135d51f877
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO abuse. One of the embedded URLs, 'https://botokaw.ru/strik?utm_term=edward+bernays+propaganda+summary', suggests a potential phishing or spamming campaign. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=edward+bernays+propaganda+summary
    • http://islta.fun/tikemevetebofojej83tds.pdf
    • https://cdn-cms.f-static.net/uploads/4390383/normal_605d7956afb34.pdf
    • https://ziluxofizavamo.weebly.com/uploads/1/3/6/0/136009732/geziruzetani_weridevoxuko_janiduwezagabag.pdf
    • http://webdefilmizle.com/dioses_y_heroes_de_la_mitologia_griega_descargarhpj3p.pdf
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fe7392e752c5.pdf
    • http://cetapp.xyz/660957486369jz6v.pdf
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/wikekaxenosuwe_motikokoraz_fexibagozoner.pdf
    • http://br1.red/why_is_setting_high_standards_for_personal_appearance_importantz03u6.pdf
    • http://sayseedokg.com/iomega_storcenter_ix2_factory_resetvpb2m.pdf
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/lopor.pdf
    • http://blankid.ru/vehicle_information_app_governmentchh1k.pdf
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/8124269.pdf
    • https://nilemesobipefuj.weebly.com/uploads/1/3/2/3/132303022/lepesaba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_2663ab7c2beb43a98eb3ea46d7542bdb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ad5d330f-8e1f-4e23-a3d0-070f67818c52/19978655598.pdf
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_601b6e47c2974f03910805cc6f6e51c3.pdf?index=true
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_89b5bb1adcb6419daba15fe6d5e16d20.pdf?index=true
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_bdef26ebf38e4a2482dfb2cd34b26e13.pdf?index=true
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_ba961e97f6a54f78b5c101824f598e75.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5449657b-2711-4753-9c73-2e7672b8ea1e/information_and_communication_technology_definition_and_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f945.bin
243ba5190726786065f741f32e4b41e52985729ff260f8d9b1a6e8e3d4080306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 5540 bytes
font_01_sfnt_off00010c1b.bin
d56603c044cb7deb0903baf47ba9010277db3806b3979ed77e7c33fa7fcace7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 11072 bytes

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