Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b582a3eaaf2874…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 14:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 032f94d5409c62ac76aed990ed887d69 SHA-1: 3761ba59fe5b6d089f3ff637d25b85771f4bb453 SHA-256: 28b582a3eaaf2874987ad27984a40ab417ca1c72673c5554e8dd9b21748cdc16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains, consistent with a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the embedded links suggest an attempt to deliver further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=how+to+get+free+robux+without+doing+any+offers PDF link annotation
    • https://fo-prefectures.com/pages/files/30479807002.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/dotetatexusavewitaf.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/66083729323.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109130750518082.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/wudiv.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wuzelubujokizogufugarazar.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/huecdeeg69kels5ikjabmvnk0t/26343610699.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/49314469522.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/30003889149.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/vebowutozo.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/newawoj.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/luxifixoduxitodejuxaja.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/dozaroxurafima.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/63130853593.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/23670093497.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/32815302186.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/pegasutopidud.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfd698286---46341380326.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xowunitemevosa.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/dugovekapobedofapef.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/puwavoxufesajixelotif.pdfIn PDF document text
    • 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_off0000ae99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 17248 bytes
SHA-256: 0b2b0eafb1e2dcfa74a42290fe64666559615dbced2a08fd5dd2c141d4e26f2f
font_02_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 11120 bytes
SHA-256: 272b5552a4cdf26c03394ee4cd3d5446e79b8613ca8226f626aecc024ee4752f

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