Malicious PDF — malware analysis report

Static analysis result for SHA-256 c699dc40b65b004e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 07:56:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e9387cec536524f34b82d51bbae5682 SHA-1: 2081f4e650775c826bd081168d136ee4bc6a56b5 SHA-256: c699dc40b65b004e323658793bca26ff8ad263b4602c890f96f281cd8b63e86f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=watermark+pdf+files+mac PDF link annotation
    • https://cdn.sqhk.co/zepipawetopi/pieijij/jovegevurawunor.pdfIn PDF document text
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/4258339.pdfIn PDF document text
    • http://vokukaguvez.iblogger.org/troy_bilt_pony_lawn_tractor_battery.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/lukiwajavizu.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/2435696.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/xopasag.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/25966265890.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/Bzhdm3w/nidinuzasemirulax.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/90979633358.pdfIn PDF document text
    • http://danuseko.iblogger.org/sezogebavafesadikijekuz.pdfIn PDF document text
    • http://denarop.22web.org/velezubexawudax.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/4001e156-85b5-4ef7-9ab9-37c0b5395874/pulojudorixalufaxozipuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e18685-8e19-4140-9567-11f71424205c/3262492062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83706efe-fab1-492e-83b5-6203722eb2d9/how_to_make_verizon_fios_remote_control_tv_volume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3792c8f-9269-41ff-92d1-ce81f164fe84/wirewiketuvonasel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4f717f-a5ca-422a-aab8-167182509b62/ian_hacking_the_social_construction_of_what_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a27a759-995f-4d1b-a768-077762a8fd58/resujizoturigipadupasu.pdfIn PDF document text
    • http://ramejepazino.rf.gd/78861887038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a31fd1b-5cf0-4ef2-b00f-c84ffdef6ce0/whats_in_a_chalupa_box_at_taco_bell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d902c906-48a8-44f7-8b87-8d093c82212c/sharp_objects_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5765c2-dc40-48cd-bbe1-f066561876fa/detective_story_movies_2018.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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 5380 bytes
SHA-256: 3e66888f6b6236da13d29815e5ba7fb6e930f076753f9b89201e0777f23c3105
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 11140 bytes
SHA-256: fc126a24e4c2c5a4956a28ccb4b4c9845546ff0e0b72840cd7de7369894fd63d