Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ba7bffee7eb871…

MALICIOUS

PDF

76.7 KB Created: 2020-12-27 11:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f336c45a26c529a85b6e4bd94a9082a9 SHA-1: 86f77434468a0d5ffe4ece103165a0108756f74c SHA-256: 99ba7bffee7eb871fb298900c7988fc7e648bfec20b7c0c62c03e2115f3bfa4a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the PDF's structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=how+you+been+funny+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465145/normal_5fb45cfa3bd44.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/fgdghii/tony_survivor_winner_wife.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/2333891.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/933eafe571f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fb4ddf817fcd.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/jisutabifufesovo.pdfIn PDF document text
    • https://nopiwevupemaro.weebly.com/uploads/1/3/4/6/134653234/73ce63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f8d8e6478e03.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/SV2gffT/duvalakabifawevovuwub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_5fbdb993e90b8.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/37d346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d11776-3da7-4b6a-bc39-6dd3ab5c7a7e/2185774456.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 5024 bytes
SHA-256: b708e282faf84e74530acb489594d41551791d154d095ba3aeac1ce8f2cd2662
font_01_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 10904 bytes
SHA-256: bf1272ce91e416c252d7e1bf43b2ce61944e22c4b12039eb6555926cee1bdac6

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