Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8972de2f73c0c6…

MALICIOUS

PDF

137.7 KB Created: 2020-11-11 08:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df14547853e7aca2378e057ffce0e21f SHA-1: 610d073dace67fa6a4f642b8b7a6554299648af5 SHA-256: be8972de2f73c0c616e30122f1e37f6203db22b65b9b9e58376fde50cd51abdd
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is a link farm, with one of the external URIs pointing to a URL that appears to be a phishing lure related to 'peoplesoft manual paycheck'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffnew.ru/strik?keyword=peoplesoft+manual+paycheck PDF link annotation
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/gumamabido.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/8f5687e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/foneniz/kodi_solutions_apk_for_firestick.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/a_dance_with_dragons_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/apk_yugioh_duel_links.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/bugler_s_holiday_leroy_anderson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868532ee-93cf-4077-b854-f5927eea688a/88174001944.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/dupipibevus.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/55740691724.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/proxy_hub_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c87b39-75d7-4a4b-a970-767b63f805c5/xanupane.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/sidobi.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_off0001de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE01 5328 bytes
SHA-256: a234a7cd8756c7caada9112deacc9c1d132d086e375b3a2658c878f900695fdd
font_01_sfnt_off0001f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F003 12328 bytes
SHA-256: cb67a73db2c4ff6895789a55bc8d3238526cf51a63b3622f93f930e9004c849e

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