Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e3dd3241ae2594…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 12:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 860c2cb1cbe8868d109eacd119858fc8 SHA-1: 461116b1a8673f224df7af3c287bc8d6fb6b3589 SHA-256: 07e3dd3241ae2594879c34f4df0f11fd7c4b93a4c3e80b7156446537cf317ba2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, suggesting an attempt to obscure the ultimate destination. One heuristic specifically identified it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://geerhannutpourreussir.be/docs/upload/files/bejubazenivex.pdf In PDF document text
    • http://a-pluset.com/userfiles/65494489010.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/sirukobefodadunimog.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vopanalop.pdfIn PDF document text
    • https://bdata.vn/upload/files/tinudazejefivakakefav.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/wumivo.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/34347513284.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/degekuxasapu.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/20480251263.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/40853966416.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/51046418368.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/99366259445.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vokikoladopotidox.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wenuwezibowokuga.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/belosevibuma.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/badejul.pdfIn PDF document text
    • http://asja.ua/userfiles/file/pebirazeratowaxo.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/86504161384.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/dutexaravapimeziwo.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/48197444365.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109110823372370.pdfIn PDF document text
    • http://lscapital.it/images/file/betidorojixonerolodulup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=make+a+fillable+form+in+wordPDF 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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 16956 bytes
SHA-256: da5cd414a50d2a278a0e2ad7abcdacaecdb516805c5e88067aadc4e5c92c1d68
font_01_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 10560 bytes
SHA-256: 7e6324fb8e7d94861ba2a929ec101a886520cdaf6b8d3e5c588cf60dc1fc92f8
font_02_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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