Malicious PDF — malware analysis report

Static analysis result for SHA-256 1213cb4cda73ca59…

MALICIOUS

PDF

80.3 KB Created: 2021-01-01 20:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dfbb354f5dac492d17594c101939f70d SHA-1: b2a06919ea714d36330531439159a0f29ada105a SHA-256: 1213cb4cda73ca594d46d63cd64aba44e2cf8ccdd01a13bac715197a915cc152
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing. No scripts were extracted, but the PDF's structure and embedded links are sufficient evidence of malicious activity.

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 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://traffset.ru/strik?utm_term=minecraft+mod+dragon+ball+block+c PDF link annotation
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/5461505.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/xorawozijed-wekuridiruxerom.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/igeicP4/30792576673.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/1634065.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/6650344.pdfIn PDF document text
    • https://notapogixunimo.weebly.com/uploads/1/3/4/3/134363186/a6a8e0.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/zipedekunowir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5fb8d029a13f9.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/18ba8ceefd7.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/zapitod-xotodo.pdfIn PDF document text
    • https://xubugenaxozuxi.weebly.com/uploads/1/3/4/7/134718294/6b2283d0e4856.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/4544377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2567bca-7fc2-4f22-9ea7-46f11fd02971/rocks_and_minerals_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1f5ff2-49da-4ed0-9fd3-3f17fa7e307c/register_of_deeds_guilford_county_hours.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 5372 bytes
SHA-256: 0690abb3b66e210a316f54ed661cc3fb0a7aebca59681baf95863034ddca6033
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 10696 bytes
SHA-256: 2f723840b979ac37473fc5c935aefaff83638e9d0e11738d1c315a7f3657201d
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802

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