Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07177cd0253e4c0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-09 14:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f1180b411226a93396df23770bf5c98 SHA-1: 0ae13eb97e8a8201716b8f311936cd81c871e6af SHA-256: b07177cd0253e4c04431f441cc12fc8d77a3110cfc725bed6ccfff1762e8e43d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a mass external PDF link farm hosted on disposable domains, designed to redirect users through multiple sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary heuristic indicates a link farm intended to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=what+is+the+main+characteristic+of+narrative+writing PDF link annotation
    • https://cdn.sqhk.co/sifolilo/8ygg9WQ/95377406494.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/gg7hjWO/villanova_throwback_basketball_shorts.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/hjjijeo/business_startup_loan_interest_rates.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/cjghgg8/11575088328.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxofalu/qjb7vid/mugalisavusuzazunubub.pdfIn PDF document text
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/sozolepupefoj_puborerogazal_juwetupojewipa_gipewanapa.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/diKDhai/18181730415.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/1dja5ij/virtual_drum_set_online_free.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/rodisureteteruliwusazoxe.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/92942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazidiw.epizy.com/bimorulejabidepen.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/how_to_teach_music_to_kindergarten.pdfIn PDF document text
    • http://nujexaraxeb.epizy.com/16161291409.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_3fedbc17349443878ef34d0c6f60a0c1.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_f54cb49823054e14ac983791439e23fe.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_ff15818d58a441d8807454114567fc30.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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 5428 bytes
SHA-256: 7763c44827e5f0a82da24aeb61867e8271a4f99cdfd449641d0299b7b1db1c39
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10548 bytes
SHA-256: 8de7b0e406d7211f054f02aa30a6082b1dcf73ec98678d550468e87501c6dc64

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