Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4d64ac2373bd5c…

MALICIOUS

PDF

73.9 KB Created: 2021-03-30 21:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4da59bbd61ef2729703b7e5824124360 SHA-1: ca3cc003b2e8a283eb2128a2f82b7a4aa8ae4733 SHA-256: 9b4d64ac2373bd5c192c1a7e94eb49e98a01eb30f97d13e14fda3c54d6c24e9c
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 0.9999

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://jumiwimov.ru/wix?keyword=whiterocks+river+utah PDF link annotation
    • http://kugufenabigidef.iblogger.org/zugon.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/ichiNgg/47348808687.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/peter_handke_kaspar.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/gjhPNgg/viguzu.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/gchehe1/arzareth_yeezy_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/hbhdmij/shark_life_animal_simulator_apk.pdfIn PDF document text
    • http://xopuwigevifuk.iblogger.org/blank_world_physical_map.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/gicejgd/irish_racing._com_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelonixaj.rf.gd/asthma_treatment_guidelines_2020.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_ba76cd3fbea6476fbbf6f0eb36dca8a3.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_6f006f6cdf70493a8f1cc3e82721acc6.pdf?index=trueIn PDF document text
    • http://niwuzowebod.epizy.com/bacterial_meningitis_guidelines_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/gvp_guideline_module_1.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/alphabet_in_spanish_worksheets.pdfIn PDF document text
    • http://limufij.myartsonline.com/39110899886.pdfIn PDF document text
    • http://puwagof.rf.gd/sql_server_2016_developers_guide.pdfIn PDF document text
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_7287620568b941b08593d3e160393caa.pdf?index=trueIn PDF document text
    • http://kerexiref.onlinewebshop.net/87881050503.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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 4992 bytes
SHA-256: 262289e15d9dc1008cd5d6ad94f02a83ff331bbb8766dbbde7751f80af5af034
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 11344 bytes
SHA-256: f2d4f557d6dacd310cb12f2e66dec5a0c02883e4051469f78ddbb4a6254df3a4

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