Malicious PDF — malware analysis report

Static analysis result for SHA-256 077c4aa3238401ee…

MALICIOUS

PDF

77.0 KB Created: 2021-04-06 11:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f24b631dba80cb4218bfda15f7e14f68 SHA-1: 1366ee381dcf5f0d99d06e2602c441dc600dfabd SHA-256: 077c4aa3238401ee19b43d53e9ea131c4fd259c6c6518bc451975fe6d378bcb2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The embedded URLs likely serve as lures to trick users into downloading further malicious content, potentially leading to the execution of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=o+alienista+machado+de+assis+download+pdf
    • https://static.s123-cdn-static.com/uploads/4495558/normal_6004c284198be.pdf
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/2685427.pdf
    • https://cdn-cms.f-static.net/uploads/4384164/normal_603c4b7478e36.pdf
    • https://cdn.sqhk.co/wifinalimow/rkgeicJ/duck_game_free_to_play.pdf
    • https://cdn.sqhk.co/dafibuxoki/pz5jami/baxogibojawusaroxani.pdf
    • https://cdn-cms.f-static.net/uploads/4375700/normal_604b1e1ebdae4.pdf
    • https://cdn.sqhk.co/wodaximewule/jbqj7hd/62065213447.pdf
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/9827925.pdf
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/e3904817.pdf
    • https://tokuzowavabiv.weebly.com/uploads/1/3/4/8/134867887/e69759dd26378f.pdf
    • https://cdn-cms.f-static.net/uploads/4371010/normal_6047d8b592b6e.pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6016739a15b9e.pdf
    • https://static.s123-cdn-static.com/uploads/4401525/normal_60005165a4f97.pdf
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/800a317be444e.pdf
    • https://maninuwag.weebly.com/uploads/1/3/4/5/134577581/suvenarasuxujifip.pdf
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/2f3eeae1914f9.pdf
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/gugugiwaketim.pdf
    • https://cdn.sqhk.co/luwagoma/cBZPawb/denadigavupazatiz.pdf
    • https://static.s123-cdn-static.com/uploads/4443594/normal_5fed7c843c1d8.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/5028937.pdf
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fcc01d9db5c2.pdf
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6033f473d1163.pdf
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/vogolubiwilesaj_tukuserijasas_kefuloviwe_nekuwon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ea89.bin
34d3dd8bcc162dfa194c5f2fc35724ec917a52134c6e13a50e55c2eae40f695a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5420 bytes
font_01_sfnt_off0000fce3.bin
c7b500214bd34de55cd15d37b9e834cef5f8912e689b806c347aac6373259a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 13216 bytes

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