Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cdd7022675f270…

MALICIOUS

PDF

105.8 KB Created: 2021-02-15 00:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f78cb5e3ff587765042c1c531fd0896 SHA-1: 5a9760d54307165d9bfcdb14f895342a0a64c986 SHA-256: c0cdd7022675f270e6ca2aefac8226030352bc2e88db9a756623bc47fae786bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to phishing sites. ClamAV detected this file as a phishing trojan, and ML classification strongly supports its malicious nature. The embedded links, such as 'https://leonvi.ru/wix?keyword=rappelz+how+to+get+master+classes', are likely part of a link farm or phishing campaign.

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.
  • 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://leonvi.ru/wix?keyword=rappelz+how+to+get+master+classes
    • http://lnstagram-verificationbadgeform.com/72048916224aoy0l.pdf
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/kezoj.pdf
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/safesozajopun.pdf
    • https://static.s123-cdn-static.com/uploads/4489061/normal_60001710820b8.pdf
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/jogusakul_vagenexodator_fovedo.pdf
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5fe938a68ffbd.pdf
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/911daa1.pdf
    • http://awpmode.com/reglage_richesse_moto_4_cylindrevz7lk.pdf
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/3713160.pdf
    • https://kitozegukelod.weebly.com/uploads/1/3/6/0/136056839/fa83bf94.pdf
    • https://jomezafivawig.weebly.com/uploads/1/3/1/8/131856232/4469319.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xixonu/blockbuster_video_song_pagalworld.pdf
    • https://s3.amazonaws.com/tazopaju/emulator_android_linux_ubuntu.pdf
    • https://s3.amazonaws.com/bulozor/all_cheat_games_on_android.pdf
    • https://s3.amazonaws.com/posaxugidut/catalogo_avon_campagna_16_2019.pdf
    • https://s3.amazonaws.com/dumupa/cessation_of_business_form.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_off00015e42.bin
d78197f634649383bfb45f008aa4fca651466f51d40ccc15341900b2036fdb4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E42 5496 bytes
font_01_sfnt_off000170e9.bin
5b85f628e85c4f15939c3dffe7e0e6cd65dbc25a501f1350888a688fbc200d50
pdf-font-stream PDF embedded font (sfnt) at offset 0x170E9 12924 bytes