Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd73f00817372f34…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 05:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38b53e044a86fb678af870c23bf69bcb SHA-1: 0545b974e7d657d0d391896997dcf4b089d911fd SHA-256: bd73f00817372f34d9b3100e609e543bb27e682d1b57675681f7ae0d36f33784
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zhjpharm.com/upload/files/50905726181.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/11128017039.pdfIn PDF document text
    • https://jurad.eu/files/file/wosepuxolavunupapug.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/57573317608.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/47870604957.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/56822394958.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tivezutufaguxufimuminikun.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/35506270369.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/11578040001.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908075358544541.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161396f7d6983c---41931748307.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/puvubonofaroratinuka.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/dijimolaxevopipew.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/80184808499.pdfIn PDF document text
    • http://tyextractor.com/d/files/nutejaliseku.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/16874394879.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/batewexifanagapegasodid.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/51205615776.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/58897488750.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/91729344641.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/44870692745.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c89d6174b---josizolukufovamavagomepam.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///vumifojesewedesisijadulud.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/43837055195.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/totarana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chess+for+ios+and+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_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 10336 bytes
SHA-256: 235f9bbe26ef4af457491a3e1542f1b56a0d32d42648c5c96f0db112389a6211
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 18156 bytes
SHA-256: 902f7d8cc181139f249066973ab1e8f14545a1ed6bd999cbe9a8c313a2f7f771
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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