Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac410b9084e0cb…

MALICIOUS

PDF

86.8 KB Created: 2021-10-08 04:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f328eebd8b0bab378fe5d2bce8003115 SHA-1: 4bbeccf1a91510e36aad2769be58b95104cf673c SHA-256: 3bac410b9084e0cb1f84ad7193e84621a359a0f402a47163f0a63eeaa4baa0ee
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 identified as algorithmically-generated and hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://queure.ru/uplcv?utm_term=a+quiet+place+2+stream+free PDF link annotation
    • http://kht.civilkozpont.hu/uploads/file/xalebezewap.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/mexetewu.pdfIn PDF document text
    • http://imbirimbir.ru/files/wunuminowazofuso.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/relijagozoxukoxoguku.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/97a1lacadh6alkec9ao8of29ar/sasalinapefiwatotiwojeb.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fimogajozef.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/keveturobuwuxevadoboki.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/32932341220.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/29137554155.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/lajetaboreginogamufu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/68982935467.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/83389231215.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/kesafoputevikajigojofu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wenexogusomix.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/lirojew.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/8052124930.pdfIn PDF document text
    • https://webhosting4.net/media/file/84520379172.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/gimofokadanager.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/xofegorepobu.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/29316901425.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/1958234423.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/foxosugibuvixuwisiv.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/zineselojezexisa.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/25112306826.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kalujesiguxedez.pdfIn PDF document text
    • 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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 19404 bytes
SHA-256: 5e79d9815ca4475c9c55171f412d1fd8a3ec2d45041a811e1429d88a077b78ee
font_01_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 10764 bytes
SHA-256: 2d3ca114d511f2bb9b6f1b65a2b49552be4de077c8138b7f023ee0467e405969