Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4eea7a045ee5a…

MALICIOUS

PDF

75.3 KB Created: 2021-10-01 06:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f033aa5f9eab7bab294e6993e2eea69a SHA-1: fcd8ec0b03b8e26ad10dc5798ef9fc8876219626 SHA-256: 81d4eea7a045ee5a28adde52d7c4a5d2792eeded51bf80dfc42a6b2f54b2817c
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, suggesting a phishing or scam attempt. The presence of external URIs and the overall structure indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=below+her+mouth+2017+online PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4f287aef93a4ca5545985ab70d5f40f3/83259654678.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/34262752909.pdfIn PDF document text
    • https://semut73.com/contents/files/bomawu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/vopubuzutobivewuxejuni.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fupaledoluvusanikusa.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/welomorisij.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/22443811602.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/nejagunetatu.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/29249691649.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/030322302165.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/roxebid.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ae7f9779b19acabdb018f99b90f1fdea/numusiwigituzulubodudivo.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/ponibobuxise.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/vasamaf.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/kalunibinaserudifab.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/1719179175.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/62654251563.pdfIn PDF document text
    • https://ienter.bg/files/31566210765.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lekurosobinalerugemeb.pdfIn PDF document text
    • http://aurora-c.jp/files/files/nesopoxamete.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/86529301261.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/xoxalirizizi.pdfIn PDF document text
    • http://successalpha.team/upload/files/93020101656.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/xutuzutekewigowukid.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_off0000b955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB955 20532 bytes
SHA-256: 916c83518355853b27b384243c1ff9533332f23b14d0fd5d7b9315c023f02e0b
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 10628 bytes
SHA-256: 13ef50e7a24efa92f831450d84cb0ed13f356725240b63a6604fecb4d8f45c08
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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