Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd6c13237cb485a…

MALICIOUS

PDF

81.2 KB Created: 2020-11-11 17:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 897f076c2fb6608ed9fc1387961d7a52 SHA-1: d570acb8f9b8de9645044e0f76cabb8e872a6730 SHA-256: 4bd6c13237cb485a46a3e9eb5f3ae610302c79fdc057f62c806d67e4289d394c
222 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/123?utm_term=flow+of+cerebrospinal+fluid+exercise+20 In PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/0f749d95.pdfIn PDF document text
    • https://wenilitedosi.weebly.com/uploads/1/3/4/3/134315728/2005693.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/logape.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/zokokamu/17731101728.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/70356991772.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/89238721230.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/cfa_level_1_books_free_download_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/the_dot_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/utah_statewide_warrant_system.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/income_tax_calculation_excel_sheet_ay_2019-20.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/82087724570.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/asexual_reproduction_definition_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/dmt_means_what_in_neurology.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/51631764809.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 5480 bytes
SHA-256: 5be3f7803b02978d479a6177c31dc52147ebc58a2df95b9553018d1288a0ed00
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 9948 bytes
SHA-256: e4b41d5ab6c03c2a49077044058a404d4729e7f8771c1b4df593a783e7d9c3ec
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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