Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbcb5014e20104a…

MALICIOUS

PDF

78.8 KB Created: 2021-04-05 11:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 058ff1b2534e5d9790adf21e8974c718 SHA-1: 7e1dc6834ab6dc3f9e6dcdc120991373c5bd1acb SHA-256: 6fbcb5014e20104a8f6e7bfb9fb783369e9162d13bdc7670e5ec040f4c8cbab1
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with several pointing to disposable hosting and acting as a link farm. The document body, though heavily obfuscated, contains references to 'terraform' and 'wkhtmltopdf', suggesting a potential lure or technical pretext for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=depends+on+module+terraform
    • https://vusimipemukebev.weebly.com/uploads/1/3/0/8/130814393/6779293.pdf
    • http://mukinumatonewo.getenjoyment.net/48740638620.pdf
    • http://mibilivo.scienceontheweb.net/famaparan.pdf
    • http://tebeririz.scienceontheweb.net/words_to_describe_poetry.pdf
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/gubanaxeneranikuxut.pdf
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/fc67ca8c6.pdf
    • http://jidudilubad.mygamesonline.org/minunatele_ispravi_ale_lui_tartarin_din_tarascon.pdf
    • http://vipadminler.org/turimekhxk0.pdf
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/gumizikeradakat-tugubu-toritafumuteme-roginumofumul.pdf
    • http://interplast.ru/my_talking_ginger_app_downloadye7vc.pdf
    • http://tefuvawilutir.mypressonline.com/upsc_mains_answer_sheet_for_practice.pdf
    • http://1xbets-regs.site/tikaruvoxunexamimalogapzbco9.pdf
    • http://libertinemodels.com/what_is_math_anxietyoexpv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xunilukegez/91488501216.pdf
    • https://uploads.strikinglycdn.com/files/1a3998de-c525-40d0-99fe-09fd6e54e917/blood_bowl_team_roster_sheet.pdf
    • https://s3.amazonaws.com/vovopafubipu/burimasivo.pdf
    • https://uploads.strikinglycdn.com/files/e734d624-a30e-4a68-b467-8bd059b656e3/12675741239.pdf
    • https://s3.amazonaws.com/lixisariwulo/functional_training_routine_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/6e9c2dcc-d271-46e0-9626-cca819ca803e/70406812682.pdf
    • https://uploads.strikinglycdn.com/files/4b0e150a-bc0a-4512-903f-18d500a45e12/6_ft_white_christmas_tree_with_blue_lights.pdf
    • https://s3.amazonaws.com/fukepez/26533672625.pdf
    • https://s3.amazonaws.com/sefabe/impact_testing_and_hardness_testing_lab_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27a.bin
3cec5b510148060df49bee49c207eda9747ec4d372610f0c4daeace30ca1da14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5188 bytes
font_01_sfnt_off00010407.bin
88924b36fbcc6fcfd8d0bb82303e768792f437058e447921e2e2e2135ab95662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 11816 bytes

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