Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8297d5f9709d32…

MALICIOUS

PDF

69.9 KB Created: 2021-02-02 11:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2355fdaec2fbee58d61df38e378f612 SHA-1: 33fe22ae6c13fc6e608d71d35cfe02bcd24c6981 SHA-256: af8297d5f9709d3293072b30fd2de48bbffa39f5433f65d15d7d16101c103703
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains a title related to an 'Android tv stick with remote control', suggesting a lure to entice clicks on the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=android+tv+stick+with+remote+control In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_601146c685383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372681/normal_5fc92816c278c.pdfIn PDF document text
    • http://brosbass.com/dungeons_and_dragons_dm_screeng50yc.pdfIn PDF document text
    • http://metazoaapc.fun/alone_status_share_chat_kannada8n3qs.pdfIn PDF document text
    • https://luxakanodaz.weebly.com/uploads/1/3/4/5/134589800/44a62eff14e07.pdfIn PDF document text
    • http://psychologyrelax.xyz/evaluation_napoleon_cm1uem07.pdfIn PDF document text
    • http://mini-cam-v2.club/purpose_of_descriptive_researchf3eag.pdfIn PDF document text
    • http://steelsho1.club/myteamcare_texas_techuilxj.pdfIn PDF document text
    • http://card2card.live/guardian_tales_laura_diary_4rpzqz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473049/normal_5fe0896cc9598.pdfIn PDF document text
    • http://barbanapoli.moscow/investor_s_business_daily_technometrica_poll2vnvx.pdfIn PDF document text
    • http://normaa-id.com/zepeposenovidajird6kxp.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/sifax_natox.pdfIn PDF document text
    • http://energierecrute-emplois.com/error_code_1073046bfmv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_60040be3a3c52.pdfIn PDF document text
    • http://barashik.space/78306009250evhuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebokele.rf.gd/88109200948.pdfIn PDF document text
    • http://nidawijonag.rf.gd/sadedabezetiwasutuxisu.pdfIn PDF document text
    • http://fotopokidag.epizy.com/bielle_manivelle.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 5176 bytes
SHA-256: 87e6abb94bd72ed8567d4f8dcbaf18f132cbf790afdc0d8a02d91d135180cbce
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10568 bytes
SHA-256: 995c8a408755e8b7dec578733e86efbd4cfcbe1d407347a66a956e85dc6858b1

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