Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b17fcc2f597348…

MALICIOUS

PDF

72.3 KB Created: 2021-02-08 06:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0092497b2602be60234499ae3f14ca41 SHA-1: 2503ef2135dec3af726571d5fb8807b0e7e38c3d SHA-256: 74b17fcc2f597348f21a7d4c7d794e9559ff3d09e78605b50f73aea5554a0c67
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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
  • 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://bologen.ru/wb?keyword=pseb%20compartment%20date%20sheet%202019%2010th%20class PDF link annotation
    • https://sutofuwanunow.weebly.com/uploads/1/3/0/8/130874369/6743596.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/vopevaxin_xuniwabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412382/normal_6001d87d84453.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/dadeguwaro_kezijesimug_tazorojepofo_pedumaxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_600deafc06eff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_6008853ec709d.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/bebf867c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fe2b6626fa0f.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/315587.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/941686.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/6473193.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/793c1b9.pdfIn PDF document text
    • https://fukajupiboxa.weebly.com/uploads/1/3/5/9/135973929/zetofave.pdfIn PDF document text
    • http://jokixulu.iblogger.org/32819827651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5ff02ba48aaae.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/remufuzu/gta_3_cheat_engine_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/repezovuv.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/42730924507.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/toastmasters_speech_evaluation_guidelines.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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 5936 bytes
SHA-256: 06367e99a86fed7bd5d652f16407898a8fda5ff10ca179910317ffb9699d9c61
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10968 bytes
SHA-256: 035dd83919f222217c022b6b2846c43bb778b72d1f2acae309441691b4534df3

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