Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a399ad3d4c4afc…

MALICIOUS

PDF

77.2 KB Created: 2020-11-18 12:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d50b1b3a6a7be466bd65a79d8faa077e SHA-1: 2dc3dbf69381d1f92887f33aef49e5da36010b53 SHA-256: 10a399ad3d4c4afc6a4222ce8667bb6d01de33767e696f1d83dc6b5d484d6ef5
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for linking to known malicious redirectors and for containing a large number of external links, suggesting a link farm or phishing attempt. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs, particularly 'https://traffmen.ru/strik?utm_term=komal+kant+vk', are strong indicators of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure itself is indicative of a malicious redirection campaign.

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
  • 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://traffmen.ru/strik?utm_term=komal+kant+vk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f8fe8d994b8a.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/dujabaxobapik.pdfIn PDF document text
    • https://rusepokobedog.weebly.com/uploads/1/3/4/3/134366979/mapopobejel.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/lebaxa/64429904197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101e7eed-4fd0-4393-8729-d17be661b3e7/joel_karty_organic_chemistry_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/18352548644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea76fbf-a2c1-4632-9b9f-d27a55ce6535/recetas_de_jugos_nutribullet_en_espa.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/zatiwozozakamasexufa.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/ibps_quantitative_aptitude_tricks.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/55280363523.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/parts_of_a_bunsen_burner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70913b8d-e9ee-4ee9-bfe9-43ebcea64f1a/89476993025.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 4272 bytes
SHA-256: 27051e1cb8bf4aaf5d144983149e894bb60b5020f4149cfdb707f9f55e0c4a4b
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10588 bytes
SHA-256: 98ac49f2c50ded1b0f53c1c7f5f416f88b4985d3439f9978b917a9d2a41c3e7a
font_02_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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