Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ab873cd2f7b605…

MALICIOUS

PDF

81.9 KB Created: 2021-04-08 00:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e217909e95013c0aac8391f81ddede4 SHA-1: 105f96a37d88509d64287d89655c63dfbff86550 SHA-256: 33ab873cd2f7b6057c2f7593c0d5a1c8ba6b175146535f450f3704b81613e1a4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/strik?utm_term=how+to+manually+drain+a+samsung+front+load+washer PDF link annotation
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/8087314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_6014a3aa870d0.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/hdAGjdq/mudutetevavodikefil.pdfIn PDF document text
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/2bc83.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/5154398.pdfIn PDF document text
    • https://naxosetoj.weebly.com/uploads/1/3/0/7/130775404/fudemejovojufutinufa.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/dichdha/367060387.pdfIn PDF document text
    • https://jatakusikafe.weebly.com/uploads/1/3/0/7/130776866/6256106.pdfIn PDF document text
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/gizotipiv.pdfIn PDF document text
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/898727.pdfIn PDF document text
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/04d2556d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5fea0cafcd5d6.pdfIn PDF document text
    • https://rilubaka.weebly.com/uploads/1/3/5/3/135303332/61195.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/a9f6c8.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
    • https://uploads.strikinglycdn.com/files/73d5d8f5-5800-4e70-9f17-fe798e005910/hermle_340_020_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5bdade-2739-4502-86cd-a9c5539c3e7d/dark_souls_3_weapons_that_can_cast_sorceries_and_miracles.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_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 5360 bytes
SHA-256: 343d8c8d3a4494a58d9192b7f81d3c7cb7dd42e04eacb40a1b7588a04ae5a791
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 12120 bytes
SHA-256: e673fff8475445cfae9cf1e38889fe1a761e1114b6e9d023fd7a9a29b0b9e067
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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