Malicious PDF — malware analysis report

Static analysis result for SHA-256 1266dab9da9891b8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 11:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e47c4322fc348f0f8ba6eddc7442de64 SHA-1: 287c79e00ce28632b606932208e740309c846fb9 SHA-256: 1266dab9da9891b8ede6dfb0ddad2fcadd229aaeec9526d34ea3911005da73d5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains keywords related to ADHD and reading comprehension, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=reading+comprehension+strategies+for+adults+with+adhd PDF link annotation
    • http://letilemugemin.66ghz.com/5560577403.pdfIn PDF document text
    • http://igcopyrightclient.com/67907807699mjuv2.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/what_can_vegans_eat_to_build_muscle.pdfIn PDF document text
    • https://sakedupepig.weebly.com/uploads/1/3/4/3/134355988/582647.pdfIn PDF document text
    • http://gililofus.medianewsonline.com/gedimilifopa.pdfIn PDF document text
    • https://verukutuxa.weebly.com/uploads/1/3/5/3/135330203/8145948.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/xugoberufiso.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/ijfv1WE/my_business_empire_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ihxVjgo/yeezy_700_v3_arzareth_retail.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/iEha3ij/gisiramarafugisunexowogu.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/56078047310.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/gjPRFif/lovecraft_country_episode_3_review.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/hjnkkjS/space_invaders_movie.pdfIn PDF document text
    • http://ulekschool.online/why_is_my_stove_not_clickingozlcu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobovag.rf.gd/cup_anemometer.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/66315733183.pdfIn PDF document text
    • http://zosejanukapub.rf.gd/guinea_pig_petco_care_sheet.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/90080766782.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/23780355359.pdfIn PDF document text
    • http://navepufukoxo.rf.gd/possessive_pronouns_worksheet_4th_grade.pdfIn PDF document text
    • http://rilevajikilesew.epizy.com/librecad_3d_free_download.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 5668 bytes
SHA-256: 60f9ac232b51ea55be0ba05de84dbe4b6dd6ef09045a67e70b7846d601942e02
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 11232 bytes
SHA-256: 98cbd834dece477841b982232e23e14bb2cb7ba125a65833f34687818e301e79

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