Malicious PDF — malware analysis report

Static analysis result for SHA-256 8869994d7c8794d3…

MALICIOUS

PDF

88.5 KB Created: 2021-03-28 17:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b90cd89ff0307c0ebf6b91000fe16d1c SHA-1: ef71f30d47432d00061c88e17d679704beb74a50 SHA-256: 8869994d7c8794d313e746c2d8b2a8e0dda005b16269e3c79ede529dea6e5f46
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=songs+of+a+dead+dreamer+pdf
    • http://indonesia2health.online/43176408475whtd4.pdf
    • https://cdn.sqhk.co/pijujuweg/haIhjc1/49477874230.pdf
    • https://cdn.sqhk.co/gapalagabig/bHjiSp4/imagens_da_masha_e_o_urso_para_colorir.pdf
    • http://cashbackk.site/sigizewu4z5ud.pdf
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/b6c5036ad.pdf
    • http://dkmz3.club/vtech_kidizoom_watch_gamesqe1vb.pdf
    • http://item-mask.top/xobogenaxitupitimudemofhlktv.pdf
    • http://uspex22.online/zebidibevenutejeroza10.pdf
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/69725c355.pdf
    • https://cdn.sqhk.co/pokivozu/iegfTHW/faded_easy_piano_sheet_music_with_letters.pdf
    • https://cdn.sqhk.co/pixafosabow/mmgihhg/biomass_power_plant_financial_model.pdf
    • https://cdn.sqhk.co/mezugifosa/jdShj8t/gap_analysis_definition_business_dictionary.pdf
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/kazozetamixizagawuf.pdf
    • https://cdn.sqhk.co/tiwefuxab/c2Hjcgi/44877061000.pdf
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/saparas-rakuxexuzizib-liwewonazejolo.pdf
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/5899810.pdf
    • https://cdn.sqhk.co/rusobotakox/ihgDhaI/acrylic_nail_designs_pink_glitter.pdf
    • https://mapizijef.weebly.com/uploads/1/3/4/4/134493838/pabaz-zamojor-sufumewiperibos-xusafatok.pdf
    • https://cdn.sqhk.co/wibezudak/GgfjaEq/xakelatimakipoguzutef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8cfb127f-dc6b-4a60-9ad7-28e9c31f2347/45603384807.pdf
    • https://uploads.strikinglycdn.com/files/bb37fa0c-7e64-430c-b949-3e7ca6a0dfcc/vapijetebigesereluli.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_off00011d66.bin
df2d8b1cd5abef77df58e9cb1e2e226ef0050d61af0793bee71730a12b11de2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 5432 bytes
font_01_sfnt_off00012fcd.bin
acfc2df8a4c87f079320da9d15f5aab423ebd3596b580d49515b8f61959191d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10948 bytes

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