Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ed7506f61ea68f…

MALICIOUS

PDF

75.9 KB Created: 2020-11-24 20:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0257eae1e37b5a3845482a5d4ece7b29 SHA-1: 924e0bf60da658f77b9f5b873e0bfb2ea63c5f49 SHA-256: a2ed7506f61ea68fa91865e4c14e61eacbf42e5bb827cd8a6b3650e29a906876
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 0.9998

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://trafffe.ru/123?utm_term=stream+ecology+lab+report PDF link annotation
    • https://sumolepixa.weebly.com/uploads/1/3/4/6/134635742/4888082.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/a40d69db-86a3-4cec-ad44-1901297cba18/tevap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8321067-14c7-47d7-a09f-b9dc482601d3/cooking_fever_apk_game.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/oxidative_stress_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/apartment_lease_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0cb90c-717f-44b1-8938-624455bd1ec3/mexubomizanajamojef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbc75bc-960b-4ac0-b0e0-ea02a662fa81/29370766163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40400fc3-7166-4891-82cc-d5eddfca3ad5/dukakijotunenamaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039e9a2d-9f7c-4ccf-af76-be6c943abb37/dj_corey_craig_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/top_free_gaming_sites_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/2328950089.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/51185901808.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/pogoba.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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 5420 bytes
SHA-256: 7bd0e685080d0397e9b9120a3223dff82d4b21ba35dc248d41d6c0bae2947200
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 11272 bytes
SHA-256: 7f1c14842e3ff04320ac995aea1f626429d0ba7c193f94ee622a001f3345969f

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