Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae879331ae472be…

MALICIOUS

PDF

71.9 KB Created: 2021-04-08 07:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5ac9f23b386cedb6c7bd42d078f6e5e1 SHA-1: 46c147454fb2d0cb0c7ee56f6eac007dde2d1964 SHA-256: 3ae879331ae472be72a6215c460eb365683bde141ca1ec871b2a2de68f1e62df
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL observed is https://jumiwimov.ru/wix?keyword=say+it+mp3+free+downloads, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/wix?keyword=say+it+mp3+free+downloads PDF link annotation
    • https://pujeradix.weebly.com/uploads/1/3/2/6/132695809/foror_jomimutofozod_dipotu.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/xafodajup.pdfIn PDF document text
    • https://vavemome.weebly.com/uploads/1/3/4/6/134609594/79df252507498.pdfIn PDF document text
    • https://xasizati.weebly.com/uploads/1/3/5/9/135978204/792fe6e266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_870df7475df647559d2e7924acfaab8b.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_ccfc122d38d34d90a47845b04d4dda88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/libro_once_minutos_de_paulo_coelho_gratis.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_6b1a236b48594efeb937bb2d323ca296.pdf?index=trueIn PDF document text
    • http://kenakazukigixow.rf.gd/lujojumikaw.pdfIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_2f78088511384956bdca1101dbc893ac.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_5bc5970dbfef4cd995e077fd4db8d89d.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_d46904d924f346a7801ed87ea2a5b9a2.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_8532e8bed57447b8871d0248b23ad6aa.pdf?index=trueIn PDF document text
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_1e8854f121c14217a68f0b0530c96481.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_1db06ee9b8544b6bb273033f24d99ef5.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_6ef1e98caae04f69a2fd1e12a3db30c6.pdf?index=trueIn PDF document text
    • http://mizadebep.rf.gd/5391809043.pdfIn PDF document text
    • http://wokixewo.epizy.com/fexutigot.pdfIn PDF document text
    • http://bedevekozazabe.rf.gd/what_year_is_my_remington_serial_number.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/dolimininevafuzumotadow.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_089cc3d295684b5ba2c01d5cda69b6dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/26910496407.pdfIn PDF document text
    • http://tifomoja.epizy.com/ue_megaboom_2_speakerphone.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/cute_animated_girl_wallpaper.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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 5648 bytes
SHA-256: 70ea74038ba3c44903a8fd69de1ee92bc42627ae16df34fc8555d9207a49de1d
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10216 bytes
SHA-256: 8ad5562b9e1fa74d69d735aa728e3a2c6d49fe17b792a1fef5111d4dae97b619

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