Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f060dba3fc87c1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 187c69436a3cc22a0e1f6f0c47ffdd74 SHA-1: e19b3776a559c79131f6e7a62a7bec27df0464ac SHA-256: 94f060dba3fc87c1d1ef704bd3fe6b43a03b81673015790581c35d999db29d2d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external links, some of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://wamaeassociates.com/images/uploads/originals/file/64401253450.pdf In PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/sakenidurubotezopi.pdfIn PDF document text
    • https://atiksigorta.com/files/moregevisawus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b434979f2---nisajifivowole.pdfIn PDF document text
    • http://teresachild.com/upload/files/falerekuloboladun.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/sinunowajiwukubekikos.pdfIn PDF document text
    • http://caramelitos.sk/files/tojeginatenos.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/kisaziseropikemin.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/tofawusa.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/xaliposelebefigaduviki.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210904233709.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/14258938236.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/64447255112.pdfIn PDF document text
    • https://pepsima.biz/files/file/18866557111.pdfIn PDF document text
    • http://bubb.cn/up_file/file/fonuxop.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/29196466249.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/75028928049.pdfIn PDF document text
    • https://luminex.pl/upload/file/vexuxaxav.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/85386524039.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/46219885817.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/wibikamenuboxululogakob.pdfIn PDF document text
    • https://premiersuli.hu/files/files/segogudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=heart+outline+copy+and+pastePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 21272 bytes
SHA-256: 388e5fa9c7d9ea52ace1c92679c8a2cf2cf290171b63e5ba46b1c4c6079ceb8e
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10712 bytes
SHA-256: 568ae32114b133618339dab63d52761a2ef0ac16d4d3685518f17c4755118809
font_02_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1