Malicious PDF — malware analysis report

Static analysis result for SHA-256 944b391e3a31e863…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 19:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21263f421ad9a7d0387f13ab712c8b36 SHA-1: 3d70d2c12230e4da1b90c5e3905b028ded181ad3 SHA-256: 944b391e3a31e863c07d4cc81ae5817b091db96aea1c3e29845ea806fa3eede8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to distinct, disposable domains, indicating a link farm designed to obscure the ultimate destination. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=life+of+pi+yann+martel+pdf PDF link annotation
    • http://aranysolyomfeszke.hu/editor_up/nijamidobedazefete.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fetofebedor.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/18970508314.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/nofufikizajotasal.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/31213027639.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109120423116296.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/feteguworunubi.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/bupem.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/56119194360.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/55895518641.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/700b3de630ac65ea15b0a1a05310ded8.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/tafunililizabekosipe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d0e290f2---mizadibofo.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/kenojipawapovowebejati.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/28774975324.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/kazunogopomon.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/pazosilinufupikevetip.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16306675509684.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/57754783533.pdfIn PDF document text
    • http://swhos.com/upload/files/juvazevozefivaxekimi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/9170803788.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/ramudakatepikovuw.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/bisabo.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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 17276 bytes
SHA-256: feb4fb570fb6a5df4b611e18d3525430120e1e0c1a8470124cb5a3af3a40c5f1
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10564 bytes
SHA-256: 78f6ee62e5e0106394843e950df72b37e23d011dd4606c0a2de84ed958a9fd8a
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.