Malicious PDF — malware analysis report

Static analysis result for SHA-256 17034c4bd4407752…

MALICIOUS

PDF

78.5 KB Created: 2021-02-26 22:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 27d3ec50c0c0001a2979725908ecd925 SHA-1: ba347a37089c98eda81c80ad982d684438e7120f SHA-256: 17034c4bd44077522a9a8ca89e2ea1e7e4b4d52ef0e8ad2dd1bf2013ab6b2914
146 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it's a link farm and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attempt, likely using a social engineering pretext related to popular media.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/strik?utm_term=the+man+in+the+high+castle+season+5+ending+explained PDF link annotation
    • http://korsabarca.com/basic_computer_course_syllabus_in_hindi_download65jbz.pdfIn PDF document text
    • http://ludshop.xyz/solving_and_graphing_compound_inequalities_worksheet_answersclqe5.pdfIn PDF document text
    • http://zumigiguba.22web.org/vepovubinodin.pdfIn PDF document text
    • https://gizigega.weebly.com/uploads/1/3/3/9/133999267/190570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fd3d97ac9b60.pdfIn PDF document text
    • http://salebox.shop/91350084051dhmea.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/kuriwuvud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_6030a227963ab.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/2018_first_aid.pdfIn PDF document text
    • http://ampinternational.org/860224793953ars6.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/74hbBhh/wuxuwebu.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
    • http://nizexududitew.epizy.com/48766678164.pdfIn PDF document text
    • http://sidabimesalib.epizy.com/formation_chef_d_entreprise_deduction_fiscale.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/lazanowikaxokedefikug.pdfIn PDF document text
    • http://wujewepal.epizy.com/harvard_financial_accounting_online_course_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 5320 bytes
SHA-256: 4cab467f0ec4390d0ebef6452916a113b78070a6242560b5725831173cfb6328
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10908 bytes
SHA-256: a9fa9121a86d976e65f10e770f85dab2ef968134c38420ecc1ec499cb786706d
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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