Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcc27079da0a59e…

MALICIOUS

PDF

89.6 KB Created: 2021-03-24 15:17:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5885e7060b7a88f2143cf86c117dfff SHA-1: 9c193487abb96a62e73a3bb92b80edaabb57676d SHA-256: fbcc27079da0a59e6095da1c74789dab5e918f6d7c06c21c18e8c6cb11f38b90
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=spongebob+excited+dance+gif PDF link annotation
    • https://cdn.sqhk.co/nabokufawogo/8ehghd6/c._i._d_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/OgijeRK/52327754651.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/jDjjTFP/tangled_soundtrack_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/bajficr/fekugovefetanopi.pdfIn PDF document text
    • https://cdn.sqhk.co/lajagika/SK9iauT/34325407147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_0ca6ef657fee42cc97f693c7d8478edb.pdf?index=trueIn PDF document text
    • http://runesufosufej.rf.gd/manesik.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_3b16a97651054966b7de0b32e57e474e.pdf?index=trueIn PDF document text
    • http://kugesiv.epizy.com/29436692550.pdfIn PDF document text
    • http://bokatamekal.rf.gd/is_dish_losing_channels.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/archeologia_romana.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_c774f7470a824522a8bb049a5d3bf11e.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_832e6344e4514a18a4d0008b9910af6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/wedimulabulezed.pdfIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_eacf71ef393b41569307e0e16e3829ed.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_69909ca9d3024e5e8f2d085a3f3be3e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/zalonemi.pdfIn PDF document text
    • http://bigofufujenu.epizy.com/german_grammar_exercises_with_answers_online.pdfIn PDF document text
    • http://samowegepor.rf.gd/puwepunakomovele.pdfIn PDF document text
    • http://limulusukad.rf.gd/receita_do_bolo_de_chocolate_forma_pequena.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
    • 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_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 5328 bytes
SHA-256: be9049c488b3fc9f884ec23f0661df8e4b2485fc99c9acd79f45dceb37ef7ea2
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11304 bytes
SHA-256: caaf4899c93297ba35ca9206031afb97f8829ce88ef85dc8e172f97cb6633109
font_02_sfnt_off00014166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14166 17672 bytes
SHA-256: 6ea76968acb33c717c773087dec517b04b2451f3b146fe0009101cec2e9d3f41