Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f42b8d6cda3e12f…

MALICIOUS

PDF

117.2 KB Created: 2021-03-27 17:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 38babe32cd63a118c9af2b67b7415f64 SHA-1: 46a2d5bc0c9abe42e3890d717849bad686f0386d SHA-256: 4f42b8d6cda3e12f89b5e53212b20ae0f8dde19031b9bbe88ac39e3342435563
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL `https://botokaw.ru/award?keyword=alfabeto+arameo+antiguo+pdf` points to a suspicious domain, likely serving as a lure for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=alfabeto+arameo+antiguo+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ffcc5a869c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_604dc7a4e74c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_60413f95d9f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6044915261848.pdfIn PDF document text
    • http://wavoximebipota.iblogger.org/88907087328.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/meade_telescope_repair_centers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_6046f84e6c154.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/australian_accounting_standards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_602e4e15616b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/zapel.pdfIn PDF document text
    • http://wuwepapose.epizy.com/90904315973.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/9052484614.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/circumference_worksheets_metric.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/31943533809.pdfIn PDF document text
    • http://timarofata.epizy.com/dozamexuminirexajipanek.pdfIn PDF document text
    • http://zukugomofam.epizy.com/assessing_student_learning_in_higher_education.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/44903730392.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/50204759146.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016ef3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16EF3 22828 bytes
SHA-256: a99e8fda6656510f1115d7f711ca29fc2bf211d47e593a6e15e8ddacfbebb373
font_00_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 5312 bytes
SHA-256: 21f6c1025e938486ba87682bd5a550b37366cfd5651be82e0c23b9fe02a6f538
font_01_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 1636 bytes
SHA-256: c2cbab77b99d6370890eeedfc4e0cd811b2ad6a1ffe511188706aaed0790a858
font_02_sfnt_off00013884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13884 17380 bytes
SHA-256: 8dd55c85d478be4ea6e9645f9c243026468be12b211e9d6c01ace8fe1b36a400
font_04_sfnt_off00019634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19634 16640 bytes
SHA-256: 77238b579693da3792d5b8f4fd25657373518452e5087a74dd931ed1da0d4fba

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