Malicious PDF — malware analysis report

Static analysis result for SHA-256 924253cf749203c3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-29 11:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57e12c3cfd41cee82ec2be8e4aa1304a SHA-1: 7c2318f305ed3ed5d0e7397b09cb81bd62ac2174 SHA-256: 924253cf749203c36e44e229ebd3e09a5970e946bc92d07d1ab141255d802e7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archiw.gbpopatowiec.pl/img/upload/files/xawajaru.pdf In PDF document text
    • https://cleanenergy.mn/uploads/files/78628067183.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/39755513530.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/zamuwox.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/17924239642.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/48574335713.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/jotekitidodedexe.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/liburesugatubifepa.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/kidol.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/89224985130.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/53173954018.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/melebaxalizetezobov.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/71683005842.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3d16d957a3aa129c9e5f3833f1f1ee55/49218769380.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090401081253.pdfIn PDF document text
    • http://arucax.am/user_images/file/vuwenokagorazogaxoneko.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210929151631.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/balifediruburifuvalegapo.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/23519015576.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/tinatinexupidolediju.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/gutofidokewuwa.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/79310540538.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/liminisanepipulaxerobad.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kimor.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/50396645814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+retrieve+memos+from+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_off0000b45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45D 10612 bytes
SHA-256: ad9577d51753490e0a3a5cde4543af4c6423d7afa80a73a391f836dc928dff24
font_01_sfnt_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 19552 bytes
SHA-256: 1d43da6991dd5cffe8e53bb28fabf6a57738b3be38abf82903554513bbfa67cb
font_02_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1