Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33d490cc46a1149…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 14:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4aae96406dc96ea15db5bc5e8f9add7 SHA-1: 2135aaec1f10a6d35aa08ea1b2ad8d6eb4aa6a76 SHA-256: a33d490cc46a11490c28eed8a3d4080938d25e21abf96232a3dde22645c92bd0
146 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The document contains numerous external URIs, with a prominent one being 'https://resalured.ru/wix?keyword=supertv+apk+android', suggesting a lure to a site offering potentially malicious content. The presence of a link farm heuristic further supports the classification as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=supertv+apk+android
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/86d4b4.pdf
    • http://sinomefonok.mywebcommunity.org/32989626771.pdf
    • http://vezdesami.ru/vupowosefokuvosezijizfh0oa.pdf
    • https://pilologalegalek.weebly.com/uploads/1/3/0/7/130740349/7867705.pdf
    • http://lazokiwumemo.mygamesonline.org/81698446510.pdf
    • https://cdn.sqhk.co/jorisuzil/hgT3boR/starfish_manor_hotel_nautica_suite.pdf
    • http://riwotivadejud.sportsontheweb.net/5303819687.pdf
    • http://vevapefin.sportsontheweb.net/chemical_bonding_notes_for_bsc.pdf
    • https://cdn.sqhk.co/zovitamojim/hf5af0u/sudoku_easy_printable_with_answers.pdf
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/bcdfdaea.pdf
    • http://terugate.mypressonline.com/machine_learning_for_finance_in_python_datacamp_github.pdf
    • https://cdn.sqhk.co/lazogapuvo/0eFItx7/24419190433.pdf
    • http://dutov.org/68675647377lpg3c.pdf
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/lebis_xorasotiwodum.pdf
    • https://jadozuvar.weebly.com/uploads/1/3/5/3/135312187/3303902.pdf
    • http://javosewo.sportsontheweb.net/24080062507.pdf
    • https://cdn.sqhk.co/lerutefo/jgehajh/islands_pasadena_menu_prices.pdf
    • http://rijoginijamibeg.mypressonline.com/novajafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pavujiniz/cartoon_song_pagalworld.pdf
    • http://pijosufun.myartsonline.com/80832469389.pdf
    • https://s3.amazonaws.com/zoxewudunigus/rawesinuxuro.pdf
    • http://kepofif.onlinewebshop.net/dell_optiplex_780_sff_windows_10.pdf
    • https://s3.amazonaws.com/figugipopar/66578445239.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0c.bin
25ac10d9af40905ee2d2cf1981ba8351c88b1242eca4ad60d1e37aadcc4aadeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 4852 bytes
font_01_sfnt_off0000ef9c.bin
d458238a295fc739c1996dcbc096d7859b321fa074919de36662f79dd350572a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 11732 bytes
font_02_sfnt_off00011716.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 4324 bytes

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