Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c77b57b31ecda…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 17:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57db178f09ed24358ab27d332a1a0d7f SHA-1: 187cad595bbf8e5c8d886013daa72728a96464e0 SHA-256: e41c77b57b31ecda24be369d58caff39b9c1dbfff27b50614cfd3c6580794b47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external PDF files, suggesting a phishing or malware distribution scheme. The presence of many distinct hosts and the use of UTM parameters in one URL further support this, as these are common tactics in such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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 http://gymostrov.org/gymostrov/userfiles/file/vawagopidixijivex.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210905_23741877CA37C1F0.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/firisuto.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d7d83ed5821b83c1e51b1e3191a2c9e4/vavizevepuwawogewubiloxa.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/kegaxis.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/92225241607.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/17432888057.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/kijelakolopapurojuzipe.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/42504435378.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/33880856886.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/65886791713.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/73416546460.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090210103047.pdfIn PDF document text
    • http://fxlcd.com/upload/file/192070095.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/kevivegukonetepekeduroz.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/vetasobopiti.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/rozifeninoxilaxoru.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kilaputowiruzivonuzil.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/34290564673.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/59015927869.pdfIn PDF document text
    • http://namngonviet.com/user-/files/zazapipuzevedagewenulop.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/sigifuvoparike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=setting+mock+locationPDF link annotation
    • 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_off0000b50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50E 15240 bytes
SHA-256: 7e536b49ca033cf2144abf361ae141aeb8711d1e7a5a98161a162d55f09d727d
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 10472 bytes
SHA-256: 9579451e3faaa6cad635be3d6934703db6c112a341d7fa28cafec80219bdf814
font_02_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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