Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a187a48101582d…

MALICIOUS

PDF

80.5 KB Created: 2021-03-23 14:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2e4dbac76a29072621cd55b123510209 SHA-1: 5857d1280abd950062b45dcafc4334212a988e49 SHA-256: a5a187a48101582d716847b544ba3f92ec8efb2906325acf88b6cf947b250acb
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/wix?keyword=msu+cable+channel+guide PDF link annotation
    • http://pedron.fun/28359023383shwq1.pdfIn PDF document text
    • https://nenatuver.weebly.com/uploads/1/3/4/0/134017756/ebd55ad6c.pdfIn PDF document text
    • http://idealslimitaly.site/58175159431k8tzu.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/fosojuzidavobeve.pdfIn PDF document text
    • http://cashbackk.site/jetufixoxo77qig.pdfIn PDF document text
    • http://azules.ru/wojekumisikirigumpb3.pdfIn PDF document text
    • https://mamapesuwilataj.weebly.com/uploads/1/3/4/8/134857931/vosifezemepetifikoge.pdfIn PDF document text
    • http://jibiduseg.22web.org/63368161775.pdfIn PDF document text
    • http://dabuvede.66ghz.com/48451234258.pdfIn PDF document text
    • http://amsidisi.xyz/jidixipateroso250i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_99feb5df6ca04327b31c13fcd7662086.pdf?index=trueIn PDF document text
    • http://vobulag.rf.gd/barfi_movie_songs_zip_file.pdfIn PDF document text
    • https://383fd46b-cc41-47b7-9379-19c19d7bb1fe.filesusr.com/ugd/81c43a_15cd0edc7ccc407082f14385ade3dfdd.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_5e1a5760a49446e687dcfdaa33030e3e.pdf?index=trueIn PDF document text
    • http://dixolasafu.epizy.com/believe_it_or_not_facts.pdfIn PDF document text
    • http://lamumabazekutum.epizy.com/zinigolapizi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 4940 bytes
SHA-256: 44ae117df412be2b9eb3bcb7838f6eae5282376dedd0e8ed99146bb7f73b6f9f
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 11496 bytes
SHA-256: 2c72fe561fef79309b58c105d2946871ba16d6bdf0e12b49385db29f8b2087e8
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3