Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadb28ce4670184f…

MALICIOUS

PDF

81.1 KB Created: 2021-05-08 11:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a43ec3cae9c800128f4fae31d123f584 SHA-1: d35a027265f4d7fd1e0b5f214a7916fe789ba7f6 SHA-256: aadb28ce4670184f81dcf42f98d335b0d2bbbf20b3eb93b5dee763974bbb21d1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF's primary purpose is to host a large number of links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=manual+de+puestos+y+funciones+de+una+empresa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498330/normal_604160544f7d5.pdfIn PDF document text
    • http://lasns.fun/989120169467gs14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_5fc943ea384d2.pdfIn PDF document text
    • https://muxolebutelun.weebly.com/uploads/1/3/2/7/132741382/a811ba.pdfIn PDF document text
    • http://itanah.space/tirenorufuzamarowemelowuk8rf0m.pdfIn PDF document text
    • http://filmera.ru/dovagiwuheq5j.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/mezuduzivarunevovowe.pdfIn PDF document text
    • http://wowitaly.pro/games_to_play_with_friends_when_bored_online9ns7a.pdfIn PDF document text
    • http://busibear.com/the_problem_of_pain_quotesikxe4.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/bopuligapavamulozzhqj8.pdfIn PDF document text
    • http://saudiautoinsurance.com/kenmore_trash_compactor_knobm5bvc.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/4004653.pdfIn PDF document text
    • http://oblakova.ru/5946268872ukdi7.pdfIn PDF document text
    • http://slamelina.website/broset_violence_checklistjpr7w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_60177bf753ffc.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/internship_completion_letter_format_wordixzed.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/88295818155ttfuy.pdfIn PDF document text
    • http://24goodstore.site/489587696302wu7p.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://circleshtang.xyz/66676946079a18yr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410694/normal_5feedddb4e91f.pdfIn PDF document text
    • https://jumedewumeba.weebly.com/uploads/1/3/4/3/134310957/4b76e0c5641.pdfIn PDF document text
    • https://zunifoxorim.weebly.com/uploads/1/3/4/3/134320692/8148472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 5408 bytes
SHA-256: 4ea21ce30b84dc930ad78d514075f8631dd832b8e0313280e0f8aadc21bf5f51
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 11772 bytes
SHA-256: 8247695f6651622d1e7bda3c27dfb6e442f6455bb8ba6bbd579c16ae31a421a6
font_02_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 16232 bytes
SHA-256: f9e711f2bfa3a8b6ac2e655ede59d1153c5b1845b6ef0bf43f0f7514c3c7ee70

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