Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4a56664b474cba…

MALICIOUS

PDF

70.9 KB Created: 2021-03-01 18:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a77c730696e58b93f5bff8d1942f6032 SHA-1: f610677724d14856a70163270b5d06634a4e6910 SHA-256: cb4a56664b474cba76b63226fdc514168797a3bfef68eefad2cc7583accc8ab5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a notable one pointing to 'https://xajibur.ru/wix?keyword=things+that+start+with+a+t', suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with attempts to disguise malicious links within seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://xajibur.ru/wix?keyword=things+that+start+with+a+t PDF link annotation
    • http://starkrobotics.org/77616074631deiym.pdfIn PDF document text
    • http://dipolomisegon.iblogger.org/what_are_the_types_of_ethical_hackers.pdfIn PDF document text
    • http://lovemecompletely.com/maru_varthai_song_mp3_downloadznmtp.pdfIn PDF document text
    • http://agencymedia-ig.com/59385538989ixx20.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/cuanto_es_un_metro_setenta_en_centimetros.pdfIn PDF document text
    • http://ketadiets.site/jogesuwnscm.pdfIn PDF document text
    • http://twenty-promo2020.ru/gods_way_to_ultimate_healthvs6zk.pdfIn PDF document text
    • http://6gusevshop.website/70738082872tannf.pdfIn PDF document text
    • http://zvezdasevera.online/exclamatory_sentences_examplesyxqa5.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/their_eyes_were_watching_god_chapter_19_quotes.pdfIn PDF document text
    • http://curvepreloved.com/what_happens_in_the_end_of_the_book_ugliesmh8k6.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/59bb895417f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/lakalise.pdfIn PDF document text
    • http://rivibowotifuk.rf.gd/91388102654.pdfIn PDF document text
    • http://nedopukini.rf.gd/70609599843.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 4956 bytes
SHA-256: a90a5c60156f89f1ce3b6038217db61f57e4145d512a96666954dd20c86175fe
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10148 bytes
SHA-256: 82aad13d5e5b128d9ae8e9c6e1aae04313c21483a39c88ce5457fd4d8c503cee

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