Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4c4a82f2ae9d60…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 11:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d610f78a9d3538a3bcaba1b1c8a9b56a SHA-1: e437223a33e216c5cfe81c641a621d1d1a1964f6 SHA-256: bc4c4a82f2ae9d602afdb82c62f53b40043fa680f3c1b77ecb61fa0806dae521
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=who+owns+shark+vacuum PDF link annotation
    • http://complect-tech.ru/dumunolepujuniglm6zg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fe0851c4f603.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/juxenuno_zuxekazobalub_sofepu.pdfIn PDF document text
    • https://mitebisaxu.weebly.com/uploads/1/3/5/3/135395238/vazidur.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/9403160.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/ihajcgg/freddie_mac_rental_income_worksheet_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/4hehbic/did_it_rain_last_night_in_san_diego.pdfIn PDF document text
    • http://bet-info.ru/fpga_xilinx_tutorialpwee1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_5ffac31361ff8.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/6jtEh2J/9467124003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fe8c77d8cd5e.pdfIn PDF document text
    • http://zesamoa.online/bagozeluxowytw5w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_6b38e900646242dcb2999205091d23c1.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_b842b36ef9c547b8b50d40c3f7a5841c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/kaxavowizugolor.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/79562955686.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/42958271135.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/amd_radeon_r7_240_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/64074780547.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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5236 bytes
SHA-256: 93fdb06bf55ccb3c6a11f5daba82c25600a8bdd2117239673165a28ce48de285
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 11016 bytes
SHA-256: 5f0f598b4d125131bb78e25409c9ea3934a0aa89ff1649cb1507581abfdd733e

Open this report in the interactive analyzer, or submit your own file for analysis.