Malicious PDF — malware analysis report

Static analysis result for SHA-256 5336a6a9b1c7272e…

MALICIOUS

PDF

85.4 KB Created: 2021-01-10 18:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 891070bc9fc9da1800e95bbf0e8f8b80 SHA-1: 9eb5c1ca901661d5fa3ec8cfdcecfb980da75778 SHA-256: 5336a6a9b1c7272eb39298e260a211375e543009c44b6f0431731cc61ad488f7
244 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Many of these links point to disposable hosting or known redirector infrastructure, indicating a phishing or link-farming attempt to lure users to malicious sites. No scripts were extracted, but the presence of many external links suggests a primary function of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=bleeding+cowboy+font+free In PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/buy_and_sell_trade_offers_nyc.pdfIn PDF document text
    • https://site-1195484.mozfiles.com/files/1195484/flying_birds_silhouette_tattoo_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/VHOXghF/68867916918.pdfIn PDF document text
    • https://tovefejuxula.weebly.com/uploads/1/3/5/3/135325554/237451.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/plFgcji/9075493680.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/turebogewotuwizowudu.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/f79e782b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5fad2a38bb8f3.pdfIn PDF document text
    • https://fomikozifu.weebly.com/uploads/1/3/4/5/134511133/nosabigejipagetozok.pdfIn PDF document text
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/mexorubiruxate.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/pajukovuxetu/37936985955.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/bangladeshi_baul_gaan_bangladeshi.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_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 5184 bytes
SHA-256: eb2e230d8294d4a40f122b3697c96a1451dcc1c5ba200457eacb71b261b9af81
font_01_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 11112 bytes
SHA-256: ecab9b79d449378d07f01e4154a8a0e5421f63e42996ed78afcded3cdc902222