Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3c0a80af661be1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 15:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41b7e47939a2bc1e3a643ccdffa6acc2 SHA-1: 98b1f86dc55e84165e056252997c7e1be370c947 SHA-256: af3c0a80af661be1e2d6437e45c85ff36e5841c64ec355e7a6a3a04fc75a941f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to external websites, many of which are hosted on disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://icaalliance.org/filespath/files/20210904101914.pdf In PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/fitafo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/75910371176.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/808710542621630515938.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/83783688059.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/nadedofigo.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sojivuzokusirita.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gesarixenuf.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/38978633852.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///8555302100.pdfIn PDF document text
    • http://360global.ca/userfiles/file/31354473339.pdfIn PDF document text
    • http://taigesw.com/upload/files/fomoxolarukam.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/74349418939.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/22314619586.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/91205178855.pdfIn PDF document text
    • http://scarpatti.com/files/41162437736.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/zakajavifasewamedab.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/kigunexorukude.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/31758600805.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/kiwelevatiwivagul.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/gamavoluke.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/41784867371.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/worinituvibisabelufewafu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161312171aa96d---vozogarotewazamumobe.pdfIn PDF document text
    • http://goldmustang.ru/files/files/35913192101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+11+oneplus+7t+proPDF 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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 10408 bytes
SHA-256: 74fb16f62f8ab1177fe55f8c267f3cbce565de049739772e8b4be564b854c883
font_01_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 17904 bytes
SHA-256: c16f516cf8eecb02da4e69f30ed9f7762d98b71fc3c75de20df18183160a943c
font_02_sfnt_off0001292f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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