Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c4302054302221…

MALICIOUS

PDF

72.9 KB Created: 2021-03-26 07:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3769232c41d653f086739f05f9a1b271 SHA-1: 7ef6a28f24eddf3367ddbc207c2abac09a97dc47 SHA-256: 70c43020543022211ffc2ff1dd79e1716e8e707daf136562afad52261b7dc86e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://resalured.ru/wix?keyword=ninja+cat+game+cool+math', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=ninja+cat+game+cool+math
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5ff5793e21763.pdf
    • https://cdn-cms.f-static.net/uploads/4528876/normal_602ebd7945cc9.pdf
    • https://static.s123-cdn-static.com/uploads/4477877/normal_600179a16a605.pdf
    • http://ek-arenda.ru/waring_dehydrator_temperature_settings84aft.pdf
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fec28477af8c.pdf
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5ff661aabe8aa.pdf
    • http://samelike.site/xasoxubomhogh.pdf
    • http://bodyita.space/340614215191d371.pdf
    • http://wiinorama.fun/3866937444763gru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/feseni/lavetajaditoleb.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_a4b9bd624b2640058509dc4acba5b99a.pdf?index=true
    • https://s3.amazonaws.com/kegubinefuda/52167058710.pdf
    • https://s3.amazonaws.com/wonumafubij/93960151503.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_774f60d150564c1d9e2b61455d358bc0.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_76667f40115d480cbf6a361e06f692ba.pdf?index=true
    • https://s3.amazonaws.com/wonumafubij/storyboard_examples_for_short_film.pdf
    • https://s3.amazonaws.com/zafijukopa/nozebomiwaxiti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e013.bin
820335b7dd295a7ac14666bf1bc47843158e4e792f19396398be645e9f310c44
pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 4984 bytes
font_01_sfnt_off0000f0e9.bin
637bbb525b4a23f2e20c501d99583b8689adfdebe33ca5a8ef9437a4bec50b14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 11144 bytes