Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2fb76afb51170a…

MALICIOUS

PDF

74.8 KB Created: 2021-05-14 00:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1935aec66b667586b9f4e5499a60bacc SHA-1: 69cf9d5f5e9ea8cdafb8bc786808b54773859a91 SHA-256: 6f2fb76afb51170aa0b4961fc813fbbb35d02f2f097f582366b01ee2baa3ca91
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/strik?utm_term=ruger+lcp+leather+owb+holster PDF link annotation
    • https://cdn.sqhk.co/fusojafiza/jdLewhb/free_music_to_use_for_instagram_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/jK6U7Eu/fokujegugazukikarofofej.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/ijbgfji/kebebamipo.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/jmhigiz/support_definition_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/lafugafeniki/imKgi1J/86516212115.pdfIn PDF document text
    • http://tonarenaz.iblogger.org/reset_toshiba_lcd_tv_without_remote.pdfIn PDF document text
    • http://penibibujobufux.iblogger.org/sivosi.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/Y25heyM/pugosezejivawoxekogom.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/hhgiheI/xumaminotadisopagilun.pdfIn PDF document text
    • http://gonugotez.22web.org/brucellosis_in_goats.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/iQgh5je/dekigupebisom.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/gdtjge8/99424744282.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/ljajbzP/urgent_care_kaiser_permanente_riverside_medical_center.pdfIn PDF document text
    • http://mojoliziriba.22web.org/liburelirenowi.pdfIn PDF document text
    • http://sogigubesidon.22web.org/nofalis.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/ieagkvq/budewiduxozadelusetibajil.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwogoxozoxi/hjgjGgj/53248124204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_1f1ff760c5f8408fb17298dbadd4b716.pdf?index=trueIn PDF document text
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_91c89d6c933f42fdad115fde17a5926e.pdf?index=trueIn PDF document text
    • http://savefativiluz.epizy.com/brussels_tram_map.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_ce7201541cbb467b943739aaed7ae9cd.pdf?index=trueIn PDF document text
    • http://fubewog.rf.gd/gone_series_full_movie.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_f1dc65810fc044fa8877d27ddf7f9e7c.pdf?index=trueIn PDF document text
    • http://visunizuze.epizy.com/23054185545.pdfIn PDF document text
    • http://koxujitedosu.epizy.com/employee_self_evaluation_sample_answers.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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 5436 bytes
SHA-256: 9a0c31115cc609852806dcecf12dedd13e30c45c164d53009953accc975abdb9
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 11204 bytes
SHA-256: d6e8773cbc76e94ad86e165cf0bc6cbbda8452e088475d0b5ee54730a9d69b17