Malicious PDF — malware analysis report

Static analysis result for SHA-256 742a8300e8f24c97…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 10:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef87af36380945e3de9ee70dab09fdd2 SHA-1: a950cd6cb0246ee47ad2405017ead09bd1d2581c SHA-256: 742a8300e8f24c97cdff9dcc1903ca02acf4a0b34a33e11a43fb39ee83669c29
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://druttle.ru/123?utm_term=good+food+guide+gift+card+canberra PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fd1363937142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_604a592aac806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_603d35f20af10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416810/normal_600e454d719dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5ff7eb2dee0b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_5b98b334b31341ae98afe092c501268c.pdf?index=trueIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_929f6032fcd14f75b67c7d840c24c6aa.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_eafb2198e6ce4f04a07e69061f9da1ab.pdf?index=trueIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_2634b44b94014bbebcc20fb81bd72fd0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4799de-e9b7-4b6e-bcdb-8c52fb45f1d6/46307989593.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/waste_water_management_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a180f9e9-351c-4342-a1b5-0db7cb8caae7/pachislo_slot_machine_model_7777_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693e0ced-3c61-44fa-9b68-f6d9fc16de81/todugunujalozuvilowadigas.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_5a7742bc65a24fdc82617c773ab4fc65.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_d62d0c0b883f4de0b92ebb6257db8c10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagokiko/how_long_does_it_take_to_charge_citizen_eco_drive_watch.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_30455541d7494d2f892280adfa7955c9.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_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 5148 bytes
SHA-256: 167d1e85359dbb8b64965518feb4364ac6311eced26fa8c0e88b9b3cddd35487
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 11168 bytes
SHA-256: 389d839b8825ab89f3f064d6565d881a179ff83147b8f4d4e24786b744480f80

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