Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b0432b8ce45b76…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 20:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0caefd3837b98063113c234fbde63209 SHA-1: b2ee3a5ff8a0def2f4c89cb2dbb04125a9c63f9e SHA-256: 70b0432b8ce45b762459cf52467cb45652f138339e7eb6720ea9ca69a2801226
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=nginx+multiple+domains PDF link annotation
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/dabibe.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/26017014063.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/14592529444.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/gugavut.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/72269630959.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/27378306596.pdfIn PDF document text
    • https://membermimpi.com/contents/files/34779551696.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/wegetopabujekat.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/metob.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/wugaboditukuwasexegapuko.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/tesufatudafoxojafom.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/98563765486.pdfIn PDF document text
    • http://wdnederland.nl/file/veriramumixozi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/93761961704.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/jowiparesupabafox.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/maxosumawo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/85121459744.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/9365771068.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/tewosawap.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/gajitevemenikadag.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/16403481409.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/77331699654.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/29580139816.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/vowuva.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 16616 bytes
SHA-256: 3fcd8ebb270d3906225c52d47c88b9802f88b89e0116f4fd906b65a0c8a67697
font_01_sfnt_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 10812 bytes
SHA-256: ad5caed57cb9948fdd48122537fb8dac30e5f3310a2a0fc9c04eb563fce2d741
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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