Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a7e55d5ee091fb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 00:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af74b84d9ff5be2ce44f6412cc488447 SHA-1: 590c779803abbfc9e40e3d7201fdc145c775ab41 SHA-256: 74a7e55d5ee091fb6687d4a262528ba203a54bd75f57aa4620b97e0615ef9f71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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 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://giaexploring.it/userfiles/files/tupudelidaned.pdf In PDF document text
    • http://kolbiko.com/images/uploads/file/kimij.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kikuw.pdfIn PDF document text
    • http://www.pvvc.cz/files/wufakuxofutatarilakepa.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/80490729709.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xexonawofavovade.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/guwefodokewu.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/diragemuzovope.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea37277f92---84748933581.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sejavisolesamo.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/70999313862.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/13751849013.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/84352817148.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/watisemapetoburelaxew.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/lijukilokiduj.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/22976492636.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/darobimijakenufaletotev.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/vurelevubezo.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/ziwodos.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/wuvozube.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/15844622277.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kenirisanujijuvefaburen.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6f9903922ccc06534577e2ae1aa07b82/luxexozifofasorad.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/34956764780.pdfIn PDF document text
    • http://ailizia.com/userfiles/72453833059.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210902135107.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/25574236013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+mod+apk+on+androidPDF 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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 10376 bytes
SHA-256: acd100be22b63c5d14a38449224290e4a9875c8650b0b4624ec18ff495373566
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16744 bytes
SHA-256: 475bbd846951a6a5ce200baef5ec96960d1e98d1a852c3b31e13bdb1bd698af5