Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b2c24d7c976f70…

MALICIOUS

PDF

82.7 KB Created: 2021-02-17 01:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 445410a3345ed7f489b41760e60a7ff8 SHA-1: e04625abf383914c08acb701888cdd91b84a15b0 SHA-256: 31b2c24d7c976f70b89998512756665e480f4b70552003a6fee92070aefc2e23
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/strik?utm_term=netgear+wnr1000v2+repeater PDF link annotation
    • https://dexatasudawuge.weebly.com/uploads/1/3/4/4/134477966/ec02f92b.pdfIn PDF document text
    • https://sovokuragul.weebly.com/uploads/1/3/2/8/132814371/bamuponinitoner.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/8055295.pdfIn PDF document text
    • http://hurleyshamburgers.com/descriptive_narrative_paragraph_examples9u8ns.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/jonujunezugomu-mexugo.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/fukav-kosogorag-numopomam.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/likinij-morutotisuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruzojonawa.epizy.com/wakukivapikori.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/14458448317.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/loluwegimopikaraguma.pdfIn PDF document text
    • http://samanofi.epizy.com/60612362782.pdfIn PDF document text
    • http://kanabobexodu.epizy.com/58297255395.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/bearing_selection.pdfIn PDF document text
    • http://gewekerob.epizy.com/11373817855.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/19180939271.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/94312688410.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/rockabye_song_masstamilan.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_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 5224 bytes
SHA-256: 1daa7f9b11304a9003b3a403c48808c180485655697eb2cc19c5435c7e32c3dd
font_01_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 11292 bytes
SHA-256: 8cfe1b738275c085c29d9b890be9cd4eef57ca402cb480792073f5824ef3db4e

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