Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9af05673e788923…

MALICIOUS

PDF

68.8 KB Created: 2021-03-18 01:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 342ece280c5ba758c15d5d58a27121f2 SHA-1: 20f1c26e5214526e20a26799cf1884e5205dbc93 SHA-256: e9af05673e78892313aea379101096c287357c21df111289349e6a0e98fcae72
186 Risk Score

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 0.9992

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://golowaki.ru/strik?utm_term=java+8+oracle+download+ubuntu PDF link annotation
    • http://kakorixow.mygamesonline.org/82182894018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_6052755be2a0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408981/normal_5fdfaa4a758a4.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/what_are_the_important_elements_of_poetry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5feaf378ea758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_60527ce034380.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff4f91221440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_60527c148c2f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_5fda4ca144501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_5ff600c62ddb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5ff1b8a273471.pdfIn PDF document text
    • http://paxabak.mypressonline.com/17492656374.pdfIn PDF document text
    • https://mikexilip.weebly.com/uploads/1/3/4/8/134868220/9642428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_604dde2438917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_6047aa90162d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387919/normal_5fcefd11b7577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5fcc95d80764e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5ff4c7c5a6146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_6035dbdf7799c.pdfIn PDF document text
    • https://xidelora.weebly.com/uploads/1/3/5/2/135296398/4276518.pdfIn PDF document text
    • http://dusipoweg.mywebcommunity.org/how_to_make_fitbit_calories_more_accurate.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/dojivewobasuval/14274649678.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/naxifaxerijikevemogosuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/lavizezerazamap.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/59676811324.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_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 5228 bytes
SHA-256: 6c83e6fa12fa3ecc1723fd4f9ac7440744c0e0e06a91a4f72f4e662fef467c75
font_01_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10160 bytes
SHA-256: 1071af1332bf9ede83a6639fd85cee32628820056e3d7328a3038f11e5af3c8c