Malicious PDF — malware analysis report

Static analysis result for SHA-256 313622a991fc3139…

MALICIOUS

PDF

70.0 KB Created: 2020-11-26 03:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7c564f7d3267a1d6a090186b29702882 SHA-1: 1e734611de87282843115f684c50d8378af4f170 SHA-256: 313622a991fc31396d28523821d131e557e6995b2075124d1fd6700a362672d6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, many of which are to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'program technician ii study guide pdf'. The presence of embedded URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/strik?utm_term=program+technician+ii+study+guide+pdf PDF link annotation
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/puxumifo.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fb68aee83847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_5fbedf4b3bd66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fb913a7615a5.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/1483d3cc-0779-42ca-b053-a7f7d15ba222/cable_multiconductor_4x10_viakon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea094cb-977b-4e60-b235-5e34df83f90a/56815522428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8b62ca-ecac-4201-b54b-c1a652760399/44308549489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f53b5d7-6a69-4039-a8fd-1a10ad88c531/90103759143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc28b8a8-8089-4114-beaa-2857a7e56bd8/8461970334.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_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 5640 bytes
SHA-256: c69d16abea1e3ec66d5363d441daea6545efe395a731e775ef3792407550fadf
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 10764 bytes
SHA-256: 92af34980521b5267aeaf4d32eefe4411ee2729f44e798cbd1fe5d702c380892

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