Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf3c8e4be1155ee…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 16:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30c6121480d4b69c0ba7fa72ba318c68 SHA-1: ce45badca2d2c02948bdb024b17a14590e80b38c SHA-256: fbf3c8e4be1155ee2bacb9b1c7ff7b032988e092f74b6f293af5ae90bd5de0f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to direct users to a large number of external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cuatudongnhatrang.com/uploads/files/85740518360.pdf In PDF document text
    • https://zenithservicos.com/userfiles/files/38587172271.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/62831766323.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/62729207164.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/43241459798.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/32797838462.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/sutapufegapakubigegidoki.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/87762897190.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/41645858138.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/potomodul.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161332f25d7cb0---49386564756.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/dakosotenim.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/32802257942.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/94579793118.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/24209054576.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/dukosozurilesabozenumuwup.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/80247250458.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/91139924983.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbf58f20a---29102191309.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/mexojujipifofezebo.pdfIn PDF document text
    • http://online-cycling.com/files/file/595061113.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/napibipuxajenibugi.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/tiwenojodowevonosamiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+pocket+tanks+deluxe+apk+downloadPDF 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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 10696 bytes
SHA-256: 03b48fdad8fa1855ed7c099ee32a16a3f0328ae032fd61418bb1c96bde94fe6c
font_01_sfnt_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 15532 bytes
SHA-256: 17104f47ee40ec85a820b84a735c4c90c395c2f3ba0b77c888e7de076f4a7c8e

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