Malicious PDF — malware analysis report

Static analysis result for SHA-256 1638a32b26a753f8…

MALICIOUS

PDF

67.2 KB Created: 2021-02-10 00:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ea220ddb735eb1b503c6b3db1a6de034 SHA-1: c679cdcce3f0bb72b0afd1538392dfc0e8a3ae9f SHA-256: 1638a32b26a753f8618cdc08633ba61408dc9d64efe7a93bd04f56e126a98364
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious websites. The document body, though heavily obfuscated, contains metadata related to software and PDF generation, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/aws?utm_term=kingsoft+spreadsheets+free+2013 PDF link annotation
    • http://shopeuro.pro/seagate_blackarmor_nas_440_420_software6trd2.pdfIn PDF document text
    • http://copyrightproblem.com/banting_7_day_meal_planqa815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493579/normal_60192dd828e18.pdfIn PDF document text
    • http://tixshopclub.fun/copy_file_b_khao5vla.pdfIn PDF document text
    • http://fsfsfd.xyz/tamapagiseziwevoxetorozv01u0.pdfIn PDF document text
    • http://copyright-help-center.com/ufc_238_torrent_download01srv.pdfIn PDF document text
    • http://copyright-help-report.com/annihilation_of_caste_malayalamdx0rw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413707/normal_6004b55aa0026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5ff63a18399d8.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/jfjjhi1/gukipinofonev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6018761bca2e7.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/Dddjh2g/park_it_in_the_market_greenwich.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/3KgfhjF/rolling_stones_t_shirt_women_s_v_neck.pdfIn PDF document text
    • http://blablablacar.online/calculadora_de_mercado_bdozn6iz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fe66ab908089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxufaxurawago.epizy.com/rgles_d_orthographe_d_usage.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_off0000c7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FC 5732 bytes
SHA-256: 12e0579558269431b655e0d6f4c8b8919bc8fad8faaa275386875dbf381400d2
font_01_sfnt_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 10900 bytes
SHA-256: 0fb0e790b1bc8fe44c3180744055c8a74da7876001f6e5852ce66040fab0eae2

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