Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f82e692e38d31c…

MALICIOUS

PDF

75.0 KB Created: 2021-03-25 08:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc6625312878a603927ef9c59d17169c SHA-1: 9b70cc401523b0669e9c8afc7a1ec9e59e88f041 SHA-256: 01f82e692e38d31c66a87982f58c448d8d8274dfb0aa72a25ba6716e999ed70d
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 0.9999

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://bologen.ru/award?keyword=convert+pdf+to+black+and+white+tiff PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501996/normal_600e617dcda99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5fdef00151a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6007d627ea879.pdfIn PDF document text
    • http://zivufomureko.22web.org/26360975175.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/29ea90fd-ea8d-4ee1-a13f-4a1122d81972/kerosepopovukorusuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb399ee-091e-4be6-9bfa-c22726a29549/66932490301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1c6787-86ac-4e1c-80b4-3a53fa9fe270/ge_water_softener_vs_ao_smith.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/guravutojumomikowe.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/conductor_and_insulator_worksheet.pdfIn PDF document text
    • http://xafonabikox.rf.gd/chronicon_apocalyptica_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df014310-2648-41a3-ba55-0c8bf52e8b9a/19276031838.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_42af0f87cf5a489db4a70a3821b7153e.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_d27b297f700349c495e42602385d07a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zewimu/bakimenawonaluxutinodu.pdfIn PDF document text
    • http://xanijidul.epizy.com/48114222694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c27c01-cc65-402f-968d-5bd8b08ec0df/garmin_vivofit_jr.2_marvel_spider-man_black_activity_tracker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503dfd09-7709-4789-8ef3-9e1f59c7be45/how_much_is_a_fire_ant_queen.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_2a5e47a7086947de96d69cecaefed9aa.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 5324 bytes
SHA-256: c9b8202feb3e846dc9b8bac5896e4355be8539c04d7da4ae4b90aa2e67d1ebde
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 10456 bytes
SHA-256: 3d0d154df559ef0d8c42a4cd2f50646b7346612674162d2ee667537ecc8e58be

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