Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0577b880436adc…

MALICIOUS

PDF

66.2 KB Created: 2021-03-24 11:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f17137674125be1214d07e145674ffda SHA-1: d2730fa71b0d8263b55d76c2024d9602e3ae5e6b SHA-256: aa0577b880436adca9d0aef2fb8eb98ec556beabfc6f1469c47052cce00d0d63
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or traffic redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=great+falls+music PDF link annotation
    • https://cdn.sqhk.co/kinuneba/jcty7ji/photo_editor_pro_for_pc.pdfIn PDF document text
    • http://vavawosasote.iblogger.org/danger_chamar_2_video_song.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/222110476229630.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/830437.pdfIn PDF document text
    • http://begedotupatato.66ghz.com/vefoxupefukew.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/5hfsjeq/the_maxwell_nyc_parking.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/1532436.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/bvBIgjq/fitiwavuguxawi.pdfIn PDF document text
    • https://dofusugizubev.weebly.com/uploads/1/3/4/1/134108946/4533598.pdfIn PDF document text
    • http://nezolalapiwok.22web.org/apa_format_reference_example.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/9Ghggjs/13835578142.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/Lggiiif/grow_empire_rome_max_levels.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/xixininigine_lovugukunowipig_jukanebobofoz_zozaganago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/what_is_the_meaning_of_strategic_human_resource_management.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_eedb52592e9647958b8408428a156b70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/brother_printer_driver_for_mac.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_77d4c9e2515f47da933aa652a61f88ed.pdf?index=trueIn PDF document text
    • http://xawiponifazu.epizy.com/bacillus_thuringiensis_insecticida.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/wipadozepezeg.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_c9bb10ea9227409e804546fc26d239f6.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_a2e6e97521f24aceb65cb14ff1c0303b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tudawufed/ept_reviewer_with_answer_key_deped_tambayan.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_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 5056 bytes
SHA-256: 23588f1a81b0caa0c33dd1920bc45fa7c8ece7a4383f23f5bf13e630a8303f82
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10308 bytes
SHA-256: 84e8d436e286a5230d8515be52c0f0310c18e348bcabc2c682f80dd7878ae32c