Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c5f5672a6d59a1…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 11:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ceff06041bc90edacbf889f5ec68ae67 SHA-1: f68d347ed3b06b7f318371d31d6546b45d2be2ae SHA-256: 02c5f5672a6d59a1e77d2193ae3d59c7d7a9f24ae67499174051690520b161df
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains keywords related to medical topics, likely to attract search engine traffic. The ML classifier strongly indicates maliciousness, and the presence of many external URIs points to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=nanda+nursing+diagnosis+for+dengue+hemorrhagic+fever PDF link annotation
    • https://ziwupaxibupava.weebly.com/uploads/1/3/4/3/134379030/gigexuwafimofesoxeso.pdfIn PDF document text
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/1146025.pdfIn PDF document text
    • http://gatatezeguwevo.iblogger.org/98625965995.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/jiDja3a/22962623778.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/zijenunelalax_mufiwula_dizifurujefada_mozowuguwu.pdfIn PDF document text
    • http://persequen.com/samsung_rugby_4_battery_liferz87r.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/aidjet7/44719526865.pdfIn PDF document text
    • http://winoorama.fun/madujojjvzwq.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/ffia2ii/57886719296.pdfIn PDF document text
    • http://lnstagramsupportlives.com/amnesia_the_dark_descent_apkx0tsc.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/fYShjgi/2575031900.pdfIn PDF document text
    • http://genusttwsr.fun/69180367023pj9ta.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/hJ6jgid/29031174645.pdfIn PDF document text
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/5082c21cdc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gofiguj/walgreens_humidifier_ultrasonic_technology.pdfIn PDF document text
    • http://dozopum.rf.gd/land_of_nod_sesame_street_sheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 5236 bytes
SHA-256: 870746574ce49e01bca8a24662ebfa3fb32bbc0cdcc1cb138db6fcd00c2c8ea9
font_01_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 10000 bytes
SHA-256: 23459165e07dcc3fd2b4441d419733103bfba6da60583e516e3fef54e401a314
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.