Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9bd11c1c55a38e…

MALICIOUS

PDF

76.2 KB Created: 2020-12-31 06:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3e25e97e244f88e4b9f97072e5e99d7f SHA-1: b146a01a763a702597ef2bcce0076aecc9182e41 SHA-256: 9c9bd11c1c55a38e4edb05ce018236b7c27226922a60b592fe8c7d60dadef626
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting or domains with unknown reputations, suggesting an attempt to manipulate search engine rankings or distribute further payloads. The presence of a URL with a 'utm_term' parameter indicates a tracking or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/strik?utm_term=barcelona+barber+shop+urgell PDF link annotation
    • https://cdn.sqhk.co/solumapidema/Higju0D/50210650405.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/2701636.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/sixotidesera_fetawuw_xuzomuwelimaket_vowifine.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/zevutezolexapobup.pdfIn PDF document text
    • https://jafazoragi.weebly.com/uploads/1/3/4/7/134769717/7142708.pdfIn PDF document text
    • https://duzunadi.weebly.com/uploads/1/3/0/9/130969775/09f7beb553b11b.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://uploads.strikinglycdn.com/files/6a583de1-02f4-4caa-9033-b5defae974c0/44804389448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4040c74b-ff78-444c-89e2-0462c354298b/98336749935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea93ee2e-9547-409b-957e-003827e5a8f3/84948842367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a877052-34f1-4878-8b01-2ae591954aa7/parts_of_speech_jeopardy_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981cfca8-a55e-4d75-8d75-ea438d1b01cc/jozifomorodobagepujobasom.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/latin_billboard_awards_2018_performances.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/83119795711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e67c9f5-ca8b-4392-b909-7b634f9c6e22/equations_with_rational_coefficients_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbc9143-84ca-4793-a7a7-29993ea4af96/tupazusumikepeja.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 5140 bytes
SHA-256: 05cac2df3d07dc8b5d83f5f9e2b47ebf5b346885260cb26e61d675f71ebe0bc8
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 11948 bytes
SHA-256: 1784385c576b26e07e2227991f454a86b843eef4992ff81c79d30e2014434c78
font_02_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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