Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5629a7a6b62409d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 22:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4c67482019ecc86304bc02a7d8cb096 SHA-1: 259256da1efff8f469a9f708c48e1da6d01800af SHA-256: d5629a7a6b62409d3191c92770291fb9ec8c45e51cfccc62d91ebf4f1e92d0f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to numerous disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://artgallery.devctn.com/ckfinder/userfiles/files/37500791069.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/48488455158.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/lisefit.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/dokewifepomuwojapupe.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/vojoliluregim.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4ca58755---fopanidelitikozetiwufo.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/43980093527.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/48541000686.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kazov.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/maxowowitonebexojagago.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/rusipamovuzuvojupod.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/labivodarowakuliwiduvoge.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/sojomeviwiwomupuwinumawim.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/69841011014.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jebinakuruwupekalaran.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/60324776069.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/nubojomovuwo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lanijabe.pdfIn PDF document text
    • https://unosms.us/userfiles/file/85098574900.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/48270136210.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/kotovemu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/24674811307.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/3278744326.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/gaxevizujupomilizodeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=webrtc+android+sdkPDF 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_off0000d14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 18300 bytes
SHA-256: 92801993c8b39530b98323922e0aef3f4a73c58815a0a4edc5deda16fe894bb9
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 10540 bytes
SHA-256: 355b74b152fa64b6421ee87526dab02adee0fec3a393391486ff18bb9846bcb8