Malicious PDF — malware analysis report

Static analysis result for SHA-256 823fa144ef0cd284…

MALICIOUS

PDF

84.4 KB Created: 2021-03-15 15:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 050ffaa0b1616f00c0dc30724b2df93e SHA-1: 3d45aa9ea3526ef760fd758e2dd512124758bac4 SHA-256: 823fa144ef0cd284346e3a6d265be8faf5f11acaa28ef3973e804b8f7684679c
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many of which point to disposable hosting services and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=walkabout+travel+gear PDF link annotation
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/5906025.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/eQfhjhe/modern_family_season_1.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/ajaie6z/x_games_mega_ramp_height.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415754/normal_5fecc9668ae30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472760/normal_5ffac71c81007.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/office_365_exchange_administration_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/somisafeg/gjgiegh/rewrite_conditionals_exercises.pdfIn PDF document text
    • http://inmyshtangen.xyz/speak_book_all_charactersibxfn.pdfIn PDF document text
    • http://musc-media.xyz/vawitefafekosefiguvas84.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/l7RicL4/zivuzewalubomumujokagu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417988/normal_5ff437dc2c4a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_600ea81534a44.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/takazuxudip_givisemal_fuzalit.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/iqnpiea/rakifipenipelirurariv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5ff3315154579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibefemojus.epizy.com/gavudupilepegozobonawevu.pdfIn PDF document text
    • http://batuzotunar.rf.gd/vaxofixenepujaziv.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_8cb0a250d5864603bad28716669543ec.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_150849ea9c6e45f4b3bda897c1cd2d4a.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_0499060d06544058b53fc067a93d5c00.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_5982d89232ed4c22bc28014e938162fe.pdf?index=trueIn PDF document text
    • http://xagewozutuke.epizy.com/12304084659.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_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 4952 bytes
SHA-256: dbc74f7b7acf94d34601e93ce3bdc84c0a3d284226e3dac90155709c72815d96
font_01_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 11228 bytes
SHA-256: bc8c12d717add275ec760d973e01f860737caad231688a79c087497f7f172be4