Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a42c0adc52f7b7…

MALICIOUS

PDF

101.3 KB Created: 2021-01-06 21:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8313aafce315e46e3403d3ebc3f95729 SHA-1: 31ca8ddea74811384158a5278501f24f804e4b33 SHA-256: 41a42c0adc52f7b7701704181c2507df10545868777607cbf9ef4ade812496d3
156 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, including a critical PDF_SEO_LINK_FARM rule, indicating it contains a large number of external links. The ML classifier also assigned a high probability of maliciousness. The primary attack pattern appears to be a link farm designed to redirect users to potentially malicious websites, as evidenced by the numerous external URLs extracted. No scripts were extracted from this sample, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafftec.ru/aws?utm_term=lagu+bleach+opening+4 PDF link annotation
    • https://metubunotawe.weebly.com/uploads/1/3/4/5/134595280/2c13a6c830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5feb6904cd0e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5fe2e3536d193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5f99e7789ec1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jiwisi/dknight_magicbox_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/neat_handwriting_font_practice_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9602f1-64c8-4e4c-8867-d988ca8c8228/22920850980.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/nigagenoxomizawepibumov.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/gexisupukimix.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 15704 bytes
SHA-256: f600a5c52eb71baac3030452d6a96c3bafe901a11324dafa8e585c0212963514
font_01_sfnt_off00013ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE5 5092 bytes
SHA-256: 4d99feeafb95fbfc48245a41ecd80069afa00b8f69d89c9d184efeb953db79c0
font_02_sfnt_off00015032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15032 6064 bytes
SHA-256: 181683cfd5afb868ba869bd45ec5e988da6cff4800f32eb96d2df9b350e42f98
font_03_sfnt_off00015fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBC 12276 bytes
SHA-256: 2a3da2f0e1f7e7514e2a2cafd150825dd5360a41952285e2574b9e0cd11af3f8

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