Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb9fff30a29b979…

MALICIOUS

PDF

98.6 KB Created: 2020-11-18 08:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c184c36aa1449394ad211a98c4d69474 SHA-1: 292e14a84ed3fd241d4901d0ccde5785e7d76781 SHA-256: 1cb9fff30a29b979053fb708092f4a7d7b59835ca96f236cc3f62e0e9626b162
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/strik?utm_term=the+avr+microcontroller+and+embedded PDF link annotation
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/duvopiwowupid-jimupo-xevijogumuxi-pazesaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5fa3cbf89be47.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/ravuxudibure/nugifemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5f16da-c854-46db-b02e-94f449831d2f/how_to_drive_a_golf_ball_like_a_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8167a4dc-26f3-4504-be6c-3b334d761dc5/nikon_mc_36_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9717b8ea-f669-4f3c-9245-2d707efcaaf5/wrongful_death_attorney_new_orleans.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/80292736399.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/92159320000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e88721-2d94-418a-bf1a-8b0f97e38d8e/lagibimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7706db45-c281-4113-b06c-22d44e0d7d02/43769086719.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/79704740259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095c67be-b897-415e-9240-d8abe0de650d/53626993345.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_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 5148 bytes
SHA-256: 78578f27f639a4509e3c5ed55037bbb8c7b7a639db13d37d6c54aded44e66b1d
font_01_sfnt_off00015433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15433 12728 bytes
SHA-256: 9e5fe20c0b3ff94ed4505d21245a8bf0f5559d27b5681ae63e9edbe22c97fb6b

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