Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc305419f1826bc…

MALICIOUS

PDF

74.1 KB Created: 2021-03-08 01:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3eee4e28ecd0bfd655250d46e0767f94 SHA-1: db68b893e5272b072217c0b3bfb5fa335e7d023c SHA-256: 5dc305419f1826bcc020fd004ac93fef870658a09b8af311d2b2884158c07bbe
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'yafferge.ru' as a known malicious redirector. The presence of a large number of PDF links and the ML classifier's high confidence score indicate a deliberate attempt to direct users to potentially harmful content.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=speed+queen+tumble+dryer+for+sale In PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/wemobideziraga.pdfIn PDF document text
    • http://govnososal.xyz/recurring_decimals_to_fractions_worksheet_and_answersttpb9.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/00ea1ee.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/cover_letter_template_apple_pagese4uwh.pdfIn PDF document text
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/mofidaziribi-tipilura-jafef-xawanoxilipi.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/1286573.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/feputiso.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/robavosipudidoj-muwedo.pdfIn PDF document text
    • https://loratabupufedev.weebly.com/uploads/1/3/2/6/132695903/muvituzakete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sisaxu/33885245217.pdfIn PDF document text
    • http://vatugiw.epizy.com/what_is_f2_on_sunbeam_electric_blanket.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/zavewewazexebegiwofum.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/tadejakirewi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/64044924805.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/bipapogekudogojuvarijege.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/passive_and_active_form_exercises.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 5492 bytes
SHA-256: 4c9d30a038bb882f8b84aaf51fafaa4ad637efadad3d01a918bfaf7177b2c1bd
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 10624 bytes
SHA-256: 14ac4829c3f9951b5e861557c0797fe1015cfec9dabffdb90222a80c47a6f86a
font_02_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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