Malicious PDF — malware analysis report

Static analysis result for SHA-256 1975f6092f5c93a0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 15:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b9a0c37242795afd445dda9d58b525a SHA-1: c8546ec28de183cd0d684cae6dfe63083348b7de SHA-256: 1975f6092f5c93a01cb215d0465fbb8accdbef0b3d2b2a746d6c465b9deda2ae
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically flagging a link to 'ambulatorioveterinariosismondi.eu' as a potential malware distribution point. The file's structure and the presence of many disposable links suggest it's designed to lure users into clicking through to malicious content, likely as a spearphishing attachment. No scripts were extracted, but the ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 http://ceramicaartisticamarsalese.it/userfiles/files/7589618810.pdf In PDF document text
    • https://liepasmuiza.lv/userfiles/library/15360281121.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/geranitoroxetumasuge.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/fesulozuvez.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/revixizexasop.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/mumejuloxejumovipiwilidup.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/bipowukawexezu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1225718f---63490697530.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/80932976385.pdfIn PDF document text
    • http://119pump.net/d/files/87431264524.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/53921439873.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sinone.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/11488581343.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/vasivepufulaxikuwokikew.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/pazavijudobup.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/lijalevawipikafidejukizaz.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/64722136438.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/35901191701.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/teghgpdqu5e45b4qh454m4hs9s/suzurij.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/pokuguvuratake.pdfIn PDF document text
    • http://briztravel.com/upload/files/xajalazobopawu.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/57553291558.pdfIn PDF document text
    • https://adci.vn/data/upload/file/lobiwawasusu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332e446379b---sonaxedir.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/80093151716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jio+music+apk+download+caller+tunePDF 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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 10944 bytes
SHA-256: beea2ad1aa7bd8b2fc4338de523fdacd56879c58ab3b0ce3f916b8ff9ebfdbcd
font_01_sfnt_off0000d27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16272 bytes
SHA-256: 17e2878fd99e4e22fa36a54ad8886e79edce05ae3d1fb5a401ecc543959cef37