Malicious PDF — malware analysis report

Static analysis result for SHA-256 357c7c47bb7e1577…

MALICIOUS

PDF

107.7 KB Created: 2021-03-24 11:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 826849d7177616d1344bd80e35054aed SHA-1: bc3447a903b0b7bb6672f7aa23c56f5158f2c1bc SHA-256: 357c7c47bb7e1577a720820d7f8f01f048323c38d5adb2efeb9f22863185d9f2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to search queries, reinforcing the lure of a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=what+was+sam+houston%2527s+native+american+policy PDF link annotation
    • https://cdn.sqhk.co/tumexifukevu/jjhxsP7/ustp_college_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/gfgeJhh/when_does_boomerang_come_back_on_bet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fd1fb7d31bdc.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwasusul/eji2ESs/infectious_diseases_treatment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_601f20d6e2cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_604b1eedbe0ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451023/normal_60091271e0cf9.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/gchiajb/nakivaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/chhaLij/mavagoduv.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/95de31eb-66a6-4f8b-88ab-ba769760e135/96153239898.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_669dad6c35454b6eb358cf289772e341.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0a6e8c-1e49-4292-b682-5c854cffeab3/jevulogutitur.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/the_koran_and_the_book_of_mormon_edinburgh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66a2253-05ce-49c7-817a-ad339b678b85/peter_drucker_books_online.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_021b2f78c5fc444182fabc85692b9c3b.pdf?index=trueIn PDF document text
    • http://lenofafezanobu.atwebpages.com/81447767980.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/heat_and_mass_transfer_incropera_7th_edition.pdfIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/39443709062.pdfIn PDF document text
    • http://torejejowomu.myartsonline.com/voxizuwujesulemawiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8febf47-de48-4a6b-917e-886264438559/5th_edition_dd_character_sheet.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_a0db418117ac4874b1b11324c951fe42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/cartoon_picture_app.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_bc68dcec214b411697c72c25c9dba3bb.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_off0001668d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668D 5476 bytes
SHA-256: 6f08a7d10f6d5308d8eed3851fa4ad1bbefbd014eab7f7e67ddb11bb42d76de5
font_01_sfnt_off0001792a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792A 11848 bytes
SHA-256: d977f3807c90934c2d6ae1ef87288c587cd30a35bd1a0b52881a4acd6758a737