Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d13caddbc7c6c96…

MALICIOUS

PDF

89.7 KB Created: 2021-01-08 15:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: af2fb555e54996a031e91d8d84a29d50 SHA-1: d624e7709526d405f47b28373d9aedc0ab35e94d SHA-256: 5d13caddbc7c6c96a64ab63507bd45a6494423d1e2ac1b2fa1d43da260f79719
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to disposable hosting services. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites, likely for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffine.ru/aws?utm_term=favole+di+esopo+cicala+e+formica PDF link annotation
    • https://cdn.sqhk.co/susotizakaxe/ghNjfG8/70083274550.pdfIn PDF document text
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/3869375.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/ijqehfh/gas_prices_at_costco_myrtle_beach.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/9e3bbaa9a203a.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/poniweze-saturodixojasek-baximidotowak-bamekoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8a988df170e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5ff4f9a1e232e.pdfIn PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/faxilopipabak.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/xejexanedaweb-zajim-mexopozew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5ff283bf9b324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fcc100872e35.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/muwomapotumugi/xaviziliburidonifiwi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 5316 bytes
SHA-256: 07ccce371642206327afd11fa9ce1faa2b292137b1768f9f510d9c1600ec1ecf
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 5432 bytes
SHA-256: e073b647c9007daf044b00df44820e1b8561fc905626ce961bafe6ccf520dc74
font_02_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 12196 bytes
SHA-256: b063fcb90d40b09b6506309ba3502f2294670fa46234cc282e1f623d7823d4db
font_03_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 17916 bytes
SHA-256: f73a4e9257232389b7ab937ed301dd8f36030565680a3ee95fbc6e7537439e1b

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