Malicious PDF — malware analysis report

Static analysis result for SHA-256 305c4942c06cf905…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 21:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 26a79a9bf7e8b9786fe09b927df73393 SHA-1: 6af7924039b5f2a93800f26629b550b8bec0a863 SHA-256: 305c4942c06cf905f1a125614d393c04efd124d1cd74cdd6bde1f55809d35ff0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which are to obscure domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'Yamaha outboard services' and 'wkhtmltopdf', indicating a potential lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://gimoguvi.ru/strik?utm_term=yamaha+outboard+services PDF link annotation
    • http://repovor.22web.org/ziramivujosatugofagu.pdfIn PDF document text
    • http://my-favshop.online/pobikopu5f4.pdfIn PDF document text
    • http://tersq.space/how_to_calculate_rebound_height9fozk.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/354428.pdfIn PDF document text
    • https://zeposonuvijuz.weebly.com/uploads/1/3/4/7/134702940/dokomologalavupudo.pdfIn PDF document text
    • http://sewonmedix.ru/chronological_order_of_the_bible_old_testament_booksp2c23.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/511fd135ca0.pdfIn PDF document text
    • http://memaviwebepa.22web.org/update_whatsapp_new_version_2018_free.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/mubemon_baluzizaxubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/veledabejufi/84488190877.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/beiimaan_love_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/fluoro_guided_spinal_injection.pdfIn PDF document text
    • http://bidexegope.epizy.com/rezegi.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/what_is_self_determination_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/4744459693.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 5084 bytes
SHA-256: 63cc9ce1fa9a25dcd517d64396dc95d9ee300cc68d032a5204ec7a8644b15473
font_01_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10500 bytes
SHA-256: c2b9603dc03e39d99123a501523eb529bfc4885dd495d6c3335792b01a64f84c
font_02_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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