Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d685e6e0db674b…

MALICIOUS

PDF

75.0 KB Created: 2021-04-12 21:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0dd55dfdc275bf861f0337275051dba9 SHA-1: 738fef8d41f43a628e4b6bf70ac626c474fcccdd SHA-256: f4d685e6e0db674b870ddacafac0b60ca8af59d1ac98971ae52e3ffd8dea8747
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on a link to 'xezojetit.ru'. This URL, along with many others hosted on disposable domains and link farms, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely intended to redirect users to malicious content or download further payloads.

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 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://xezojetit.ru/strik?utm_term=seven+pillars+of+newsworthiness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6039017b3657c.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/9342603.pdfIn PDF document text
    • http://vedatolinofiz.iblogger.org/92313041019.pdfIn PDF document text
    • http://sipasurupumuju.iblogger.org/how_much_hp_does_a_lamborghini_gallardo_have.pdfIn PDF document text
    • http://fuvafutiku.22web.org/15812881536.pdfIn PDF document text
    • https://sugiravo.weebly.com/uploads/1/3/4/4/134455537/f28e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406481/normal_5ff109e65b123.pdfIn PDF document text
    • https://winenexosipagep.weebly.com/uploads/1/3/2/8/132814343/nikulopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatupux.rf.gd/android_10_google_pixel_3_xl.pdfIn PDF document text
    • http://pexirofovuj.rf.gd/fl_studio_free_me_download_kaise_kare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589259a5-c0aa-4562-b32e-95afc444babe/2263862860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159a3293-971e-41f8-b7c4-ec96693a2c5c/top_5_international_news_today.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_64216ce845c840499703de4a48f75eaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/747856aa-2b95-4342-86e8-045d81a8c5d9/29618396579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74238bf0-29b4-4f55-85d2-0af700da7a15/73782060613.pdfIn PDF document text
    • http://lofoxos.epizy.com/23157537573.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_e711fb2d269142e7b9801963a1821abd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc1368e-b440-4954-ace1-d90c3bdb54f7/86675109602.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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 5244 bytes
SHA-256: e0749c73d1af015a5776578317f807acdbfdbd9820e7b0ee55e5a78bf6a72481
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10344 bytes
SHA-256: 7502ca8b560e22bc3d8b8ab8a15e1af5cff711f52cd09689ddfe0973799d18a9

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