Malicious PDF — malware analysis report

Static analysis result for SHA-256 b155d02b34c4e856…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 18:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0f99fae006c8f1e11091386b65bb6695 SHA-1: 82c72442f8585cf3017a90ea12e181c4c38db9b1 SHA-256: b155d02b34c4e856c19249b65df9d2efeb125da2b569942c8a998f2500e23ff0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one to an algorithmically generated URL, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gaia-onlus.org/userfiles/file/67760710892.pdf In PDF document text
    • http://solartgaleria.hu/images/file/12687131950.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bafezulazilobulixekul.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138c14004426---14360932843.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/xutesoki.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/23511483401.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/25308707188.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/69143565017.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wulefewiwogiwi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/surinoloruleludepafu.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/82434823780.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bfb0e9b14---zixal.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/27972893885.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/milabuzenekegisasere.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8d08746d39ecd0d6997adae5d734c20c/54800056955.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/11535466417.pdfIn PDF document text
    • http://ctm.it/userfiles/file/5595020615.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/gidetoxi.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/58892610830.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/xosogonuxijofipofij.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/55305396505.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/xotuteligusinijexuweka.pdfIn PDF document text
    • https://alpinashop.bg/files/talawujelowinenamodad.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/bonitorawa.pdfIn PDF document text
    • https://halkum.rs/files/lotom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+make+mp3+into+videoPDF 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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 17080 bytes
SHA-256: e3413e19b02ce220e05c74e95e8caffde4316ae015fabe6abaf549e1b0529390
font_01_sfnt_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 10648 bytes
SHA-256: 8382ae73f3477ada014a0c84e02e1aeebdde3e98db22142186ef80530d3dfbe8
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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