Malicious PDF — malware analysis report

Static analysis result for SHA-256 a020bc486fdbc77c…

MALICIOUS

PDF

69.8 KB Created: 2021-04-05 00:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db1c9c1d8c431bda7b1d758a03bb0baf SHA-1: decaa3d93c96c27ba0e6ea267e80d7913e1d83a5 SHA-256: a020bc486fdbc77c94c3ebb85e793cc581bab5574f6c03a9d6545008a5112ee3
156 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 5

  • 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.
  • 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://seumenha.ru/123?utm_term=panchatantra+movie++in+movierulz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426421/normal_60446c163a37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fda8ba38d580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_604ee6a718e3a.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/8540295d-c987-494e-a324-efaac696b4f6/7961879085.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_af5974c0821f43f5b8dc9f6b567afa02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5857a3-83c9-4d3d-bf4b-6e26502049a2/21815440366.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/fortigate_80c_vpn_setup_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567989c2-a2db-49d6-8a07-df8878325998/dell_optiplex_7010_sff_datenblatt.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_6fb9046acc2e4904a520606224538c08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/madalin_giorgetta_workout_guide_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/43291496114.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_97f0790284e3457d805b51de0e5ae5d7.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_ed9437a862f84b8fba2adf7e64768cd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4989806-f2a4-4d4b-998d-f19ef48094dc/honda_express_service_center.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/dna_history_webquest_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319bda40-2ac0-44f4-8af4-88f05f49f0b0/43388189601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a98cd7a-f3ab-4fb1-9502-aad0636f54ec/degelatikolene.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_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 4972 bytes
SHA-256: 4c6fff56b8eda9a7b113aa99a5340e07be1a3ee908e03709b8259daedef0393b
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 10644 bytes
SHA-256: 7daf9a7ff8835e9d9527a844ea7506e63b745ab8ab55b79250e60f4a44f451f8

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