Malicious PDF — malware analysis report

Static analysis result for SHA-256 6083231ef13ff651…

MALICIOUS

PDF

71.4 KB Created: 2021-10-08 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 14a6ccd1b3a7bc57578a37528d7c7e1c SHA-1: 53b57585bcb08bafdb73f190c224862cfe3af3d4 SHA-256: 6083231ef13ff651f4a71c91c490baa90ffcda642d9cfb40dd6cee2e3c7f387d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm and hosts algorithmically generated URLs, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://minhkygroup.com/luutru/files/wiwevuvufawezufejuje.pdf In PDF document text
    • http://i-dron.cz/data/file/69175621111.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/suwuriviwonelawokerofu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/mobovedomelitakes.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/98483773164.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/78894845525.pdfIn PDF document text
    • https://jobtiara.com/files/files/fexegilifuwuwowisela.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/73607591606.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/66934827862.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/desisupunibab.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wojivomaki.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-20/20210920082731487631.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/19604739197.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/29968105114.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/gujovujilikexagubij.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/gejilo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/47266873339.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tebeju.pdfIn PDF document text
    • http://szjg.hu/images/file/xivokofod.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/dutexaravapimeziwo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/57611452478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fully+qualified+domain+name+examplePDF 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_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 10732 bytes
SHA-256: 582bd5db4b938d83892cf8ffdce776557061393cbc5bb675c831750cc817a8da
font_02_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 15772 bytes
SHA-256: c81218ef53991525fa31f3d9dc1d5bc6765cec9b38abbcb0be677f821421d97b

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