Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6e7f534b0660d4…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 22:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d7d5a12e663268580cfed464d03a152 SHA-1: 84e15b51d0dcac2cf7d5935ee1e122706347f97b SHA-256: af6e7f534b0660d47d187503c4459c9fee5a3f7e75e9843b3a8000a5b746db54
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 0.9997

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://fokemale.ru/award?keyword=different+types+chromosomal+abnormalities+pdf PDF link annotation
    • http://garanibukumom.scienceontheweb.net/boy_scout_handbook_hardcover.pdfIn PDF document text
    • http://clientbluebadge.com/dari_ke_word_candyfipe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fda0e8bac5cc.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/tisiwapepanajuvenuge.pdfIn PDF document text
    • http://webcam-model.online/kitchenaid_electric_stove_top_knobscf6dx.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/2004_softail_service_manual.pdfIn PDF document text
    • http://fb-ig-copyright.com/black_and_decker_cordless_lawn_mower_batteryu5xcm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_6044d590eab70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b839dd5-95c2-4219-b6f3-e095ae38349b/68264197748.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/which_is_the_best_denture_adhesive_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96ef0d9-44c3-4ba7-9ac5-df16706d486a/what_three_things_do_plants_need_for_photosynthesis_and_how_does_a_vascular_plant_get_these_things.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745da071-5c9a-4caf-8a0b-4204cb775588/tulabotiranalaxifijeluka.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_e3ad9d1f68744a2ea5d03feeebf883e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c839987-a7e3-4e09-90e0-b5919aa7355b/51923325329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f46a00-e26c-415a-8b75-f15352c05fad/patufiguji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e5af11-c449-4cd2-8b88-7bfbd3a5a6f2/jolobitaraporu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6087d1-b9b2-4afb-b3a2-b5f48bec7c94/how_to_learn_interior_design_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4244a4-8a4b-47ab-967f-b4ee2871f917/17560885185.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_265d793309dc4a9cbc262818f34d50e7.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_90d9f2f996154a73bbc6730dbef1acf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21de5b2e-9f69-44ca-a6c1-05b372c55510/laxatajazijefizetoxadibil.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_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 5636 bytes
SHA-256: ce957b08d8df33263484fb0a3b11bd551899b12810c2dde8f38423047a7342e9
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 10916 bytes
SHA-256: fe79fefed6392f900b2927b8dc749944aabf0d3f74bc16ecb52255d1874b9134