Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef09a14118875906…

MALICIOUS

PDF

80.3 KB Created: 2021-04-24 11:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f7ca76388f37a9661d66c8bc92c8cfc SHA-1: 400a07e399b6aff40f36668838dcf4aa5765f1c2 SHA-256: ef09a14118875906ead9b8f7f719d84dcf58cc768bdcd15bff05118688dc1dd6
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is part of a link farm, with one of the external URIs pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL is likely intended to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=magic+chef+dishwasher+repair PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5ffec31a2e4d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fc8ded90b74f.pdfIn PDF document text
    • https://wujenorap.weebly.com/uploads/1/3/5/3/135322769/6540095.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/tejumakasulidaliniw.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/fRgemhb/36878015332.pdfIn PDF document text
    • http://fusegufuw.iblogger.org/average_atomic_mass_and_isotopes_worksheet_answers.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/318f79a1bc29726.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/heigOig/download_any_video_browser_app.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/3731013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_602ab97fa1f34.pdfIn PDF document text
    • http://rometolipopi.iblogger.org/taco_bell_nutrition_menu_carbs.pdfIn PDF document text
    • https://golotelarag.weebly.com/uploads/1/3/1/3/131382536/b690e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_604b19492a20d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dabatisew/93183828695.pdfIn PDF document text
    • http://tabimad.epizy.com/xuzunesa.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/78810495010.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/40683119142.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/71945700402.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/294601024.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/52364282109.pdfIn PDF document text
    • http://kitalanexu.epizy.com/75283829177.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/95457546942.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/vawola.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 5484 bytes
SHA-256: 2f817a0af39c155663759a700fd05cf4b8d7acbbba3e877c87fd01fd571805b2
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 11208 bytes
SHA-256: 86cbca43392f8e9cc6368b8b65058846f9d8d1131fa303b7af4195b4f48e73a8

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