Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42715c690501131…

MALICIOUS

PDF

67.8 KB Created: 2020-12-11 03:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 338380bc87a27f235865703dfc982501 SHA-1: 5a282de04a013c9e90868b82b0794b9fe20cc3ad SHA-256: f42715c690501131b11761e6cdc8c8da9afd1af843a0eaf375e2094d40670b9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with link farms or potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious websites.

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://trafficel.ru/strik?utm_term=8th+grade+science+staar+review PDF link annotation
    • https://varodapomibaga.weebly.com/uploads/1/3/4/8/134874415/12229c368a0.pdfIn PDF document text
    • https://latebutaweba.weebly.com/uploads/1/3/4/3/134315799/xiwupa-kixugazovok-guvunorololo-nulanud.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/065dd851a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5f958c099f365.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/8724935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fa9d032784db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e70d1452f90b7fe56088/t/5fc306c7eaf37e3b64005451/1606616776293/cartoon_solar_system_pictures.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd07c845ca4f7902678c32/1606223817318/bluetooth_usb_dongle_driver_windows_7.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd080d9d104e5f152f4518/1606223890670/90156667228.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cd39d26ff1194f957f3c/t/5fcdc0118a55f2188b97409e/1607319570791/spiral_warrior_valkyrie_build.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe16a918e72e5fdb9eef85/1606293166209/algebra_2_parabola_worksheet-focus-directrix-vertex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fa32a4492a057e20be12/t/5fc96bd5dffee5551511e3a2/1607035865402/shoot_hoops_meaning_basketball.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0baae3dfdd95b60d439b1/t/5fc0e449f3de5e49b585069e/1606476874147/5042872237.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e844cd1e280355d45049/t/5fc132f708845d0924b5e4af/1606497016773/luxupumoxu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce0773c190381d6d63bfbf/t/5fcf352a5c8977691e3783d9/1607415083147/90520989062.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_off0000c454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 5420 bytes
SHA-256: 9616800d0a0193b0656a285db0070ffdeaf854fbfc27526dbec68320c7caf50e
font_01_sfnt_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 13928 bytes
SHA-256: 87786f60564a729f2287fa001f7d570234dac3de6422cbc7d56bb0fec5942e85

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