Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ddc384629f80d…

MALICIOUS

PDF

83.5 KB Created: 2021-03-11 08:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 784207b9e5f4bf530c09f7508d91dad7 SHA-1: be1a73ebe0fdaccb858eccd971320edb8a110d82 SHA-256: 8d5ddc384629f80db0f1b456eec581fbb4afd9e57e3bfcf82117b04b5d329074
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-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://zajinet.ru/123?utm_term=cissp+domains+2019+pdf PDF link annotation
    • http://slimerecipe.org/brand_new_manual_transmission_cars_for_sale9nz9i.pdfIn PDF document text
    • http://leomannapov.com/64274229674jrsrx.pdfIn PDF document text
    • http://tobubolixej.iblogger.org/pere_lachaise_cemetery_map.pdfIn PDF document text
    • http://newyearshop.site/likodamifrly1.pdfIn PDF document text
    • http://fortuneo.best/furanutiliftsky.pdfIn PDF document text
    • http://hydrofthol.space/75178994602bl9uk.pdfIn PDF document text
    • http://abanca-electronica.com/advanced_pl_sql_tutorialzjx61.pdfIn PDF document text
    • http://sollabs.xyz/lords_of_the_fallen_class_guidemyper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_37617439e8664671af3706e796098a00.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_92874ea48c9c41548eac77b5ca88ed6e.pdf?index=trueIn PDF document text
    • http://roxonotagake.rf.gd/97593166289.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_3094d2889df54cf3b61b66f6b8b01533.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8396ed-8ba0-47f6-9345-b8c534c033d4/call_of_duty_cold_war_patch_notes_12_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e41a720-0e23-4727-8720-0eec63a01b96/can_you_get_a_cat_fixed_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a47479-38c6-4aec-b953-60971cc72d0c/vupekawonobosavinom.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_1b579579a6284e569dc1667d6bc12f40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfca923-6598-403a-8913-5c3c3bf399f1/which_engineering_has_highest_salary_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736d520b-27ea-42b4-ac39-021f5d518184/pulelilodafopefolimur.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_c2090de42eb3489cbb33f181bc12ffb2.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_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 5444 bytes
SHA-256: 00317823289a0ca15303fefa7937d84bc91a8b4a7bed5db236001a9e5f32530e
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 11224 bytes
SHA-256: db5cb6d6111ff920e76d20bd64d731828149658c03fac79d3a2a0bf533b357b4

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