Malicious PDF — malware analysis report

Static analysis result for SHA-256 347f4ebedc29c7f5…

MALICIOUS

PDF

75.4 KB Created: 2021-03-14 01:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d996f4708516be056c7a2a94ac534adf SHA-1: 48ee29d82865f42eb089307ef5823b9b28e9aa89 SHA-256: 347f4ebedc29c7f56673d29f882a05f325f4c0a382a19b1b7cb9b785b62fd8e5
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one pointing to 'xajibur.ru', which is flagged as an external URI. The PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF's nature points towards exploitation of user trust.

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
  • 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://xajibur.ru/award?keyword=anatomy+and+physiology+of+larynx+pdf PDF link annotation
    • https://cdn.sqhk.co/xolanikipiz/djdk80N/promo_code_for_cheapest_airport_parking.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/4jaCopU/naughty_boy_meaning_in_gujarati.pdfIn PDF document text
    • http://zugawumaz.22web.org/mijupovomimixarebuf.pdfIn PDF document text
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/gemenirigen.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/71iaZfS/zodakoxemazovudotaka.pdfIn PDF document text
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/08708789d.pdfIn PDF document text
    • http://litamomun.22web.org/58160048977.pdfIn PDF document text
    • https://fezemopozopedet.weebly.com/uploads/1/3/5/3/135326879/vikodaturesebo.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/dobesogum/jamagavusenatikap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9b6aeb-f7f0-4ff5-8f03-180ebb1e26a3/95684942470.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/jasper_reports_with_spring_mvc_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/24584528920.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/xidanatesegosavenexebi.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/libamisemejilez.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/87023733972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2153ea-b857-4809-af58-e3db4c38e5a5/menuxugakuribo.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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 5616 bytes
SHA-256: 2e54e3ebdb60e2cb50536f97d78858da1710cf0d57f2c2136cd5f0e87685b50b
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 10812 bytes
SHA-256: 0818238cf763bdbf8a3dc873b0844fd836751d791cb44f31ad8286b1d7a66e2f

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