Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39344416818d98b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 04:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3155c4f0abf59f4d75aef6891f5e15a SHA-1: baba3b30ebde960bc38ca28d41f571f61d655183 SHA-256: a39344416818d98b34577b9525d170007e02c1174e2413ed916134b436ca2161
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple unknown domains, one of which is hosted on potentially disposable infrastructure. Although no scripts were explicitly extracted, the PDF structure and its nature as a link farm suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tn60lb0avp4rtvdpe329r23ll8/35194575492.pdf In PDF document text
    • http://telegid.tv/userfiles/file/79498670722.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wisevefifutelirixexiturux.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/kerujeravabu.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/vizozu.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/miwaboxotojever.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/87105322661.pdfIn PDF document text
    • http://standardamulet.com/files/files/fezatujamixudeloxuvidopet.pdfIn PDF document text
    • https://jagominum.com/contents/files/juwazamomipofifunixerome.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/bitodakatenenubuvefidos.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/960203265.pdfIn PDF document text
    • http://sql110.com/pic/49507911206.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/masikavojofivikoze.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/binobomemezuzanusi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/roxupikita.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/gesepebegasunogaged.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/36618783103.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/bajawi.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/35631088305.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/fodurelowilepokubabozadum.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/13320881325.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/45482616720.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/fukirirewobumiku.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2nf666c132o2hlhohhe7ievvkb/74775111148.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/ranibomavavuxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+record+video+with+music+playingPDF 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_off0000b182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 11308 bytes
SHA-256: 8357c04e3fcd010518d1fa36dcff9144f5dc2e1d6aac6cdfc39940fafa56ced4
font_02_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 14272 bytes
SHA-256: a417abcce0a79f928cab50f705c2c40b719e362ffdec93004ab393a1283227c8