Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3455f2d7801b784…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 13:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e98e328642e38d1c113aaa061b54722c SHA-1: 8eb84e704385361f786c2e51bd3f899ada0b1d72 SHA-256: e3455f2d7801b78460d185b6545b4d22bbe6d8ea887fc72a8646cfa0fdfb8604
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, suggesting it aims to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://isabellepieman.com/userfiles/file/89334119644.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/butuxejewiwewegot.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/89511591768.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/3352991230.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/siderulafodidamagabed.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/13346770634.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/14606396748.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/garovofugavibu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f2678931---70873317373.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/18790955440.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/gizemuluromivupu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/revelelevupanevag.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/91424072622.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/44097732981.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/dogafowajalugatubuwov.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/gufiro.pdfIn PDF document text
    • https://yasacompany.com/upload/files/31269322903.pdfIn PDF document text
    • https://equinox-e.com/upload/files/bokonoj.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/melowiseridexupomelazodo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/tli1tv0qt041b2skooenfrofqk/75229566043.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/41866842962.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/1684209445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hill+climb+hack+ios+2020PDF 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_off0000ac7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7F 15312 bytes
SHA-256: 2562ea93b447f91f6fed6afedcf37bf9418f41ffc398fd7dfca99d2c8f7bacd7
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 10524 bytes
SHA-256: 3b689dba4440b75983ca2cbc5b0d630e6464d8df7271e9509606413576743a46
font_02_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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