Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dd538db3fcc168…

MALICIOUS

PDF

75.6 KB Created: 2021-03-09 14:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde8785b35ea6c270621c95543ede973 SHA-1: 98b4fbcaf82ca212cfea2a8ab23f1356a5a7b39d SHA-256: 22dd538db3fcc16860d471b55788ef20faa430b219d75ae4346debce70dd9712
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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-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://golowaki.ru/123?utm_term=my+boy+games+free++tekken
    • https://cdn.sqhk.co/pufuxogife/iibiawF/77586653292.pdf
    • http://gixotakopopunod.22web.org/82420092648.pdf
    • https://cdn.sqhk.co/datujisukebe/ii4ggeJ/naija_stickers_and_memes_for_whatsapp_apk_download.pdf
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/5217445.pdf
    • https://cdn.sqhk.co/bikulatitaxe/pGjgxjh/samsung_security_policy_update_apk.pdf
    • https://cdn.sqhk.co/fakodozug/ihagiwi/santorini_makeup_artist.pdf
    • https://cdn.sqhk.co/gebemiwisero/FjagcZO/learn_game_development_online.pdf
    • https://cdn.sqhk.co/gopuxipo/dDyhgqk/white_corrugated_boxes_near_me.pdf
    • https://cdn.sqhk.co/wadalibituge/ihdEJgh/guess_the_celebrity_game.pdf
    • https://cdn.sqhk.co/pafatewodoju/RphbF50/deer_hunter_2018_pc.pdf
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/defofelafuxuwigami.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lizuseguwix/rutgers_biomedical_informatics_masters.pdf
    • https://s3.amazonaws.com/wazotojemov/aradhana_old_movie_song_pagalworld.pdf
    • http://pizubape.rf.gd/piropexete.pdf
    • http://lonuzokubezuva.epizy.com/garrett_euro_ace_vs_250.pdf
    • http://vobafuge.epizy.com/60896303452.pdf
    • https://s3.amazonaws.com/fajujiju/antenatal_care_guidelines_kenya.pdf
    • https://s3.amazonaws.com/vogubivajavofu/sanomupitipodaja.pdf
    • http://vimukomexetad.rf.gd/miwuwediweb.pdf
    • http://mozifateguvogab.epizy.com/84173104087.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_off0000e8ed.bin
b4481f022f63d34a5faf9c88657ade10b72690f618ec1b1f28c381a3a53b16b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 5364 bytes
font_01_sfnt_off0000fb38.bin
c92e9820656b50951070ceebf0f678ce5f174bf7967311cbe48457b9b8cb803e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 11124 bytes

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