Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1a5c5dc31b0f1c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 22:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee1633815fd2d0d8941bc34720d55be0 SHA-1: f6e3b15c02b7cba7b72984eaeefe3ef713b330cc SHA-256: 0a1a5c5dc31b0f1c9c2605c9b9615a4887c79d3e462a37055ca3cca478f1b575
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains multiple external links, many of which are to disposable domains and appear to be part of a link farm. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ketchas.ru/uplcv?utm_term=surface+rt+install+chrome PDF link annotation
    • http://botosani.ro/img/uploads/file/wutejoradubamuzomivawidu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/toxuno.pdfIn PDF document text
    • http://thevale.us/userimages/7154481373.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/nafapapedavavuderebuwoji.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/56508623909.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/51647571909.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/widonusatulixipixune.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/9582681204.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lipabidamewi.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/71213083220.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/vovewadakitizureginoba.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/pamerawoneresaxukov.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140b316307ce---69753334323.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/nizumavefasakifavag.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/52196675430.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/kogomazisifaxes.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/87965009619.pdfIn PDF document text
    • http://mutitar.com/user_img/files/narugukiluvaxul.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/68535105282.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/waxoxujazofinukipepoz.pdfIn PDF document text
    • http://congluc.com/upload/files/63936340352.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/48150786511.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/pugenomozeje.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/ruzelukupakifibob.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/luguvukakoni.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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 19128 bytes
SHA-256: 8e278bd6e28f5d2c0b55c5318316cbecc868e1340ee1e66c2c87e263d472e234
font_01_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 10776 bytes
SHA-256: dc4b4ff0140496705039ea239cbd9bac4e2c6f1b312f22a5c67897d168869595
font_02_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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