Malicious PDF — malware analysis report

Static analysis result for SHA-256 080dfc3d1df5b209…

MALICIOUS

PDF

74.2 KB Created: 2021-02-09 10:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7121201a7f0a054e9135a5930d179b53 SHA-1: 8768d63b6181612b285d54e6fed122b15d8b6bc8 SHA-256: 080dfc3d1df5b209df8cd8e3b7780878d798abc38e45c19a8396f3cb2c7d52f3
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 external URIs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution lure disguised as 'prefix suffix worksheets 6th grade'. The presence of multiple disposable hosting domains and link farm characteristics further supports a malicious classification.

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://jacksth.ru/aws?utm_term=prefix+suffix+worksheets+6th+grade PDF link annotation
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/kikogamo_baxarujenazafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_5fd31a6d13573.pdfIn PDF document text
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/kifumirajikuz.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/rjhhajf/tiktok_mashup_october_2020_with_names.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ff7fc6f687f2.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/jAt7hbf/mountain_climb_stunt_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_600004e494191.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/i1Vheib/uncertainty_avoidance_culture_definition.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/bejijuvesa-zajuxemabebari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_601fda80c000e.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/kuwotugesatilu.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/ggjwrji/simple_literature_quiz_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/jcgiijw/76293435133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxomin.rf.gd/charge_sheet_format_in_marathi.pdfIn PDF document text
    • http://xurukat.rf.gd/fairy_tail_sad_theme_flute_sheet_music.pdfIn PDF document text
    • http://tefinavi.epizy.com/bio_data_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/wawexusidisa.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/gaxizidukaxewi.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/sheet_set_egyptian_cotton.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/english_tagalog_dictionary_apk.pdfIn PDF document text
    • http://fereralud.epizy.com/careless_whisper_violin_sheet_music_easy.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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 5516 bytes
SHA-256: 551b9e0989b78c3c8ef33b62010efa60414d153b9704d8d72a4fff74b3658a6b
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10840 bytes
SHA-256: 847cca6bc6903c28a891e216616ca0f948673fd56a89a840b4d4e0b9acd3d0a3

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