Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d918dc1a6acd12c…

MALICIOUS

PDF

60.5 KB Created: 2020-11-10 19:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 76fc43544fff468b23eff0cb4bce7de1 SHA-1: 781b2e2b3b0e56ff0e1414857e6a72051633ad3b SHA-256: 2d918dc1a6acd12ca7c925c37e0f47d341da11138435b75d3b588a11259370e3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to a 'Toro 51599 manual', likely a lure. The presence of multiple external PDF links, some benign and some unknown, suggests a link farm or redirection strategy. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?keyword=toro+51599+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5fa1223f65438.pdfIn PDF document text
    • https://poxedavuk.weebly.com/uploads/1/3/4/6/134608045/473d75b2.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/d5d92ec740.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/2643403.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/vinade.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/613735ff-0525-48da-bf7e-a0d96cebf93d/walt_disney_accomplishments_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf0cf79-9247-428c-8513-c28010df928e/11935842943.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/convert_oxps_to_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0300a8ef-b60d-41ee-b85b-073608f4cff8/fate_core_character_sheet_online.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/kajetazetokufepuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051d46da-4e8c-4775-ab35-ef8d7aba2f55/nioh_warrior_of_the_west_armor_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0a93a4-2a01-4a1c-a181-a952fc338ea2/22144087685.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/karadorinuwoxi.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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 4932 bytes
SHA-256: 0d2ccd1bebabec04cf8b05f6911d0a86e3be0a983f9786ad90e344a2723f46eb
font_01_sfnt_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 10352 bytes
SHA-256: 0d5ab8b44e68f1253e9ebc52db3035842ff8a0e48cfd00b4093173d1d5366dfb

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