Malicious PDF — malware analysis report

Static analysis result for SHA-256 243db2dfea112e81…

MALICIOUS

PDF

73.3 KB Created: 2020-12-17 09:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 961a4bb6ac45d735dd6c93fbd09c3078 SHA-1: 15b5cdf37c61271717b185309f464c65c572d93a SHA-256: 243db2dfea112e813a2f2d7837363fcaa22fcfc3ce73adcf054865a03eb9ce6c
156 Risk Score

Malware Insights

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

The file is a PDF that contains a mass of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming operation. One of the primary external links leads to a URL that appears to be related to search keywords, further supporting the spam/phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/wb?keyword=difference%20between%20accuracy%20and%20precision%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5fdacaa53e1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f88bdb552837.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/pegozegam.pdfIn PDF document text
    • https://luvumape.weebly.com/uploads/1/3/4/4/134438520/d7b5ea610.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/6975e0.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/ratixifo/caste_certificate_application_form_ap_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c33a2db-7aef-4523-a280-77133be7d2ad/xejufosif.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/anandalok_pujabarshiki_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/81871686499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae8b7c6-6a00-4058-b034-f0a652352849/tigewaxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6912cac-4749-4060-9948-1ae5778b15c5/33545315098.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/hebrew_alphabet_vowels.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_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 5332 bytes
SHA-256: 3cdf65c2de1aee856483160b9fa606e87a169cef2006f8c9a2ca90aebfee9732
font_01_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 11104 bytes
SHA-256: 2d255cb7c3e65a6c569ae9f6df41559a3e4be092ecb14ef1a2c8102f247a4683
font_02_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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