Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3b469040e80905…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 00:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4164d379ae69eaa905ec208862979999 SHA-1: 49ca2ca0e62217bf70c46a3b4840229f2d334389 SHA-256: 9a3b469040e8090597886e0ed724e6e02d2f635e8a80f5f3683adf6f95fd7066
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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 https://crewmak.ru/uplcv?utm_term=call+me+by+your+name+novel+read+online PDF link annotation
    • http://kondicionery-elektrostal.ru/upload_picture/file/nifiwikimuwewazelifame.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sulipilomilebifu.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/suzebi.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/notevobalejuf.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/pukif.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/72910646611.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42597257875.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/jepajowunu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/tisofegavivemifekutolegif.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/94705024316.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135759f1941f---fejivitaxajomuwezuja.pdfIn PDF document text
    • https://kawanmto.net/contents/files/rizikisuzideporodel.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/68713400121.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_001400.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/46450070645.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/femolat.pdfIn PDF document text
    • http://apart1day.ru/file/1897714379.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905052415.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210909192621345.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/233a838fab525fdea1a301a9a2f9da63/9932612354.pdfIn PDF document text
    • http://iphysiology.ru/upload/jotizovolasikuxulix.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/suwujoxeka.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nojefateboxewajedabudeta.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 10596 bytes
SHA-256: b0a209935539186d64af7514260a1a4f9a82688a4efa84a853d5eb598949e257
font_02_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 17348 bytes
SHA-256: e5e90ba1b69632e65d961f64cd055e8c74390b02376a0447fac749b63e0c4342