Malicious PDF — malware analysis report

Static analysis result for SHA-256 282523fa0770f64c…

MALICIOUS

PDF

86.8 KB Created: 2021-03-15 21:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdc30d6170aaf9d3b0549bfc49c8ac51 SHA-1: 1246111f587bd52912a47f1a5c861583ed0aac5b SHA-256: 282523fa0770f64c87d9910f6ade7fffe79ad43b8aea387bb788833350e89194
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 0.9995

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://mezovuduw.ru/123?utm_term=alarm+clock+for+windows+8 PDF link annotation
    • http://pumujavebedopa.iblogger.org/focus_group_discussion_guide_example.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/dgf9hak/jopigamokaselapafuzuki.pdfIn PDF document text
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/gedofax.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/2863518.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/wudol-wobipiwidinu-jipoge-zovotosuzulinit.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/xoferuvedij.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/gNUifme/ahla_malik_dancer.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/nevabawevodike.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/tufolixejedotemenutazab.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/0jbqLkF/sasenokutedofaropuvukubu.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/731da1a2a810d67.pdfIn PDF document text
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/kojewoworurajibog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokarodefi.onlinewebshop.net/zubijezijasobu.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_365e0526a20b43a683cf4129c741771f.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_ffa6d48894304c1fa5a098ed653e7b8d.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_eb12f01152cf4282b049e90a781c2f16.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_fa643beaf4d741b487158dc9ff8b0a69.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_9bbeb9c747bd4eb39f98c147012876fa.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/allen_bradley_plc_price_list.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/27682079210.pdfIn PDF document text
    • http://lenaxepejo.rf.gd/temporal_bone_dissection.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/how_to_play_blues_scale_on_bass_guitar.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_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 5504 bytes
SHA-256: 1a7662e512eb5618e55b2706524396402201069130e181405ca6e0dd71d31251
font_01_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 11572 bytes
SHA-256: fe95285f94f3daa41802f7eed96e1cc2afceadbc54134acd9e31facd1dd252a3