Malicious PDF — malware analysis report

Static analysis result for SHA-256 0776603166a1da1c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 18:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9e6d92f74ce738f376ef29a3da48d4e SHA-1: 14e10a456b29e9bd5a8f2aafd5d8ba1deeab8039 SHA-256: 0776603166a1da1c9f94105c3141e9b8df28b286c8aa8d39818c6963b47874d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://maymaygiaydachidang.com/upload/files/51445417827.pdf In PDF document text
    • https://odontologosmalca.com/images/userfiles/file/79288542772.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/24598526868.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/88367520780.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/moroz.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/vabijukapefijojarasumu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f5b06f6cb---79273053697.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xoxenufifugavavarevefemi.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/53293772265.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/91233647860.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/93690558333.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/56695650800.pdfIn PDF document text
    • https://dafelia.com/files/30024021605.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/11152983943.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/lomisudi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/21847172847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=headaches+and+dizziness+in+pregnancyPDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10696 bytes
SHA-256: 2c109790a4cb0d3730e6928c00ccc784b1d6b9b71a2483434d915c0d266f8e0a
font_02_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 16836 bytes
SHA-256: 729fda209927e70e01331129612e35f9ba523c1003c2c235c7cfd4df957bec9b

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