Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f144b3e2132d667…

MALICIOUS

PDF

74.2 KB Created: 2021-02-23 13:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d0a2e5f89f233d70a5c8b355c0918df5 SHA-1: 7ab9c4f692a6f70f243c4f8f908291ffc17143e5 SHA-256: 4f144b3e2132d66728ad7cfa9b28b08d5f8d991c7aba57a22096281126ab6cac
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to disposable hosting or known redirector infrastructure, such as https://yafferge.ru/strik?utm_term=how+to+unclog+a+hoover+vacuum. The document body, though heavily obfuscated, suggests a lure related to common search queries, likely to trick users into clicking malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://yafferge.ru/strik?utm_term=how+to+unclog+a+hoover+vacuum In PDF document text
    • http://gemotebefid.22web.org/56880477374.pdfIn PDF document text
    • http://xudikuruno.iblogger.org/72084981077.pdfIn PDF document text
    • http://carins.info/dictionary_english_french_free_for_pcu827k.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/81613448190.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/marquis_de_sade_justine_deutschbemu4.pdfIn PDF document text
    • http://labincom-med.ru/how_to_increase_speed_on_2014_club_car_precedent20pqi.pdfIn PDF document text
    • https://ponegibafuzixi.weebly.com/uploads/1/3/1/4/131406662/7096638.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/remunupuki.pdfIn PDF document text
    • http://tvoyoproc.fun/60574872033wwyng.pdfIn PDF document text
    • http://ximasoj.22web.org/50530444558.pdfIn PDF document text
    • http://gufutaca3.xyz/rupezijojutebekaxs7wl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulumasofip.epizy.com/3d_cardboard_horse_template.pdfIn PDF document text
    • http://pasebuda.epizy.com/26307015345.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/cheat_sheet_means_in_english.pdfIn PDF document text
    • http://ponadimajuv.epizy.com/vosisumover.pdfIn PDF document text
    • http://xazinipigoxowe.epizy.com/vendor_aging_report_in_excel.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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 5148 bytes
SHA-256: 306fc876e489f5ccb355b3025df324d106de132c142d44a7a276adf4a49d9ec6
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 10512 bytes
SHA-256: 5fa399eda6e1aa36bfb84e64612c592b44e7e00e454f8d805400ac2ebee57e42

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