Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd69c4b2ad65f760…

MALICIOUS

PDF

85.7 KB Created: 2021-05-22 21:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9b5fb8a489db217af2c671faf4146515 SHA-1: dd529416401b92deaa80476518e5af31e33aad1c SHA-256: cd69c4b2ad65f7606495c6e362d38e3a4e713c32e7735527fe490106b5974599
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=realidades+1+capitulo+4b-8+crossword+answers+page+89 PDF link annotation
    • https://nafugawiwira.weebly.com/uploads/1/3/1/4/131438392/fejixelo-gexakonetubedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_6008e5557be88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5fd355ece2111.pdfIn PDF document text
    • https://fatopozan.weebly.com/uploads/1/3/4/5/134581496/c7f4300e9145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_600dc910c0691.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/7413712.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/6f7498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_606de8c2c67e4.pdfIn PDF document text
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/2cd61fad5849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fe92674927a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_604d1c75bd40f.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/mijosivonibiv-luzubuzowed-susonokilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6032d3b85d766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/27602387934.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/lafeniwe.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/sinopsis_film_the_hunger_games_mockingjay_part_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5016f38-9aac-4a34-b3f3-5b4618adf8bf/puvuguxifedase.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/accountability_software_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5b7d63-b443-49ba-a017-d1654ff797d8/90398685642.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_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 6000 bytes
SHA-256: 70c6e8b7aeda27f65891a89869ccc931c9354bef9ef5444c920b8c18b85d2950
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 11632 bytes
SHA-256: ff2746805175ebc55f8eae9a8d56979a724585886b3376d7ddd48cd8ed6f4281

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