Malicious PDF — malware analysis report

Static analysis result for SHA-256 7110a1e84764cb59…

MALICIOUS

PDF

79.0 KB Created: 2021-03-09 13:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a86904e66e10535953c69cacae74db0b SHA-1: d1f29ecb47324c74362ec2dbfb592cf308876fde SHA-256: 7110a1e84764cb590885db43ffb2cdac1bb74632122733a27619e9f79594ebfa
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://dugedepap.ru/123?utm_term=teacher+lesson+planner+template+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fcbd8bbf05d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5febf8b792678.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/zotegusu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5fcd544790bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_60472afc962d8.pdfIn PDF document text
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/dasakawoj.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/piluxibosino.pdfIn PDF document text
    • https://giminabev.weebly.com/uploads/1/3/4/6/134601645/wazabobajixi.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/742279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422368/normal_5ff5b1f4ae9e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_603a5414c125e.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/xupoxabuwax.pdfIn PDF document text
    • https://pofuzopabo.weebly.com/uploads/1/3/4/3/134307265/zarumufanuvuxa.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/fenixexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5fcfafc8389a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fc6de4020e95.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/calculus_of_a_single_variable_early_transcendental_functions_6th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 5344 bytes
SHA-256: 26bc4c117127f1a044b586f5e2630b6f8dd771494ecda72b5c942addc9174934
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10400 bytes
SHA-256: 77a535be5894a5951ca8bc0a21305dd33c52317132d33b2983fea4f22a33f8be

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