Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed32353348543e6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 23:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a621521ad514a9b8f96156fd494da893 SHA-1: 3ae66ef7fdf3b7594a5f8544b9a3632174135bc2 SHA-256: 6ed32353348543e6285a5d49d5d96347cad7195b3b2574f5a5e176db76392c48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gangwontaxi.com/FileData/ckfinder/files/20210903_7D4903306D479184.pdf In PDF document text
    • http://neza.cz/UserFiles/File/16365625171.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/depavikofeliramotogafun.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/razozimarisumamejumepuw.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/tevaligusaxixurilupadat.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xuveresanakuwebaloje.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903230713.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/negotivenufinopogof.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/82469990606.pdfIn PDF document text
    • http://kustari.net/userfiles/file/kepufisizazoxijis.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/41342009747.pdfIn PDF document text
    • http://haki.vn/uploads/files/68770687690.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/jarosofojov.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/52083617211.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/61660429449.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/37829866136.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/dixifafazerureli.pdfIn PDF document text
    • http://teknis.it/userfiles/files/74218126258.pdfIn PDF document text
    • https://polandpools.com/contents/files/jubexiwudobijesuma.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/402dacf9e176903662830e54a9f4208b/29698802819.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134528c818f2---40668601601.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/65132762809.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/86999671958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=unlock+sd+card+passwordPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 10372 bytes
SHA-256: c763a0046dad27fe91d8ec25593cc1e416a093659c244ac3e4ff272d40798fc6
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 18400 bytes
SHA-256: 3e7a08d4a315225785d703c20ac879df35e53a4552153b47ec61c73dc092b400
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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