Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7761d9c157b81d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 06:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ec8eba871df1a7e7bcaf99d949e8037 SHA-1: 0f1fe78fafd070b690fa43cb9ff23cc91935d146 SHA-256: 4d7761d9c157b81dcdac2fc8a6313671a4aac73ab1d55151ac710e738a856c11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating its harmful nature. Embedded JavaScript and a high number of external URIs, many pointing to disposable domains, suggest an attempt to redirect users to malicious sites. The PDF structure and the presence of JavaScript point towards a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://orsini-blasioli.it/userfiles/files/50988254410.pdf In PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/vowuluf.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/93339669423.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pusolidalejigo.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/7964855129.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210912/file/1631424384.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/75459254103.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/98261947616.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/97396211567.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ad04e1063e5b63b3710a14f4d6225759/70219966830.pdfIn PDF document text
    • http://usagimatur.com/files/others/pemutituwojiwujusaritope.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bamakofebozaxora.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/92524516691.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/82069276488.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210911_185551.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/61417802281.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/senavefegoza.pdfIn PDF document text
    • http://laserinnsbruck.com/static/73511540363.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f7fc542b---mipodixurewirisonatoku.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tirajasenosofelu.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/99073676050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cool+things+to+build+in+your+minecraft+housePDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 19188 bytes
SHA-256: 8748a8d4a1007745ce157ba5ec9912d9ca5f7190fe938d15f30aab2a65574727
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11308 bytes
SHA-256: f3fe501ea13b8d283c8702c466cfd7c63e187caec85c40f6ca281a722b59510c
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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