Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe5e623c67b29e5…

MALICIOUS

PDF

75.6 KB Created: 2020-11-19 21:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 27f49f81b9e618db209615e474ca856a SHA-1: 1da198d1de0a086894a1bb9f1550aa531d3fcc08 SHA-256: dfe5e623c67b29e51bfb991b701f96035e6270169d4d831a66a7b67d59fe3a80
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to external sites, likely for malicious purposes such as phishing or distributing further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=lesson+2.6+practice+b+geometry+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f8e5c6e53719.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/9cf972bf8ccbab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5f9f3df7eb4b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8f622ea2129.pdfIn PDF document text
    • https://rilirali.weebly.com/uploads/1/3/4/2/134235358/867043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fa4c71969923.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/4ac53815-cdb2-4b95-a00b-ebf09b89dbe0/complete_warrior_guide_twom.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/81687855275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f998896a-1e72-4d85-9a38-6fbccfc34cc6/batuzivogapuk.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/say_something_piano_sheet_music_free_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/4175123682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c3d795-2072-4e80-85c5-c51cf3c0bf80/fat_city_band_florida.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 5812 bytes
SHA-256: 658ce88fcdf567702678c68336e84e46ab5db658f6cbc6b0658d1b950b59984a
font_01_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 10920 bytes
SHA-256: 7aacfd2af664ee0bf6b6f0a3ffeceaf7f35bdd1c16ac3a3508853b7696278d28
font_02_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6

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