Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bb5c2840bde63f…

MALICIOUS

PDF

83.9 KB Created: 2021-02-14 17:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cadbd3cd0a25ccece991c108007d5eb5 SHA-1: d34ec830854fbb66aa323debe41c1f811ea809cb SHA-256: c8bb5c2840bde63f8579c445cafcf7803f0cfda4bc0881f9544beaeb478e00c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=murray+38+inch+deck+belt+length PDF link annotation
    • https://cdn.sqhk.co/viforoge/7wdhg80/mp3_player_online_download.pdfIn PDF document text
    • https://wadoruzog.weebly.com/uploads/1/3/1/3/131379034/jirokozi.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/6cd5a.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/4051398.pdfIn PDF document text
    • https://lakomefolowe.weebly.com/uploads/1/3/0/7/130776578/7967450.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/newade-kotagigojuda-gugozijaginiz.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/UhbAYgh/classic_scary_movies_for_halloween.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/baferedoxowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://merizipu.rf.gd/letobofofu.pdfIn PDF document text
    • http://luvojidepezepag.epizy.com/62068717076.pdfIn PDF document text
    • http://nasapatede.epizy.com/24378876374.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/zuvaxomavovujojojudo.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/nonexevozuvidokipug.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/akira_movie_all_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/air_fryer_cooking_times_cheat_sheet.pdfIn PDF document text
    • http://feporomiwa.rf.gd/pulanuzap.pdfIn PDF document text
    • http://gasoxesa.rf.gd/present_perfect_progressive_exercises_with_answers.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 5692 bytes
SHA-256: 55c0cda2a395e20f5b401e9f9f392b091eb85095aabe57c51a00e5d98bcc2989
font_01_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 11240 bytes
SHA-256: 713651dd75701d6c7141932def5f1936a12be418ddbe62a421b0e254063bd1ab
font_03_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 11408 bytes
SHA-256: 3c28167834b846f95583d04332cd54ab34ef42d2cc515bf535a1725304097fab

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