Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28ab3bbeb98b1e2…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 09:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6b5203e8160dcd0d74cd4306d2906b5 SHA-1: eb6762c4d97f5d76f4c005d527d8a9ab9dd1c83e SHA-256: b28ab3bbeb98b1e2cc6fd8151e91c8fc594d5733b61e31ed3aa3c3be0c437618
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. It contains numerous external URIs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=vinkle+video+downloader+without+watermark PDF link annotation
    • http://biancoacolori.it/userfiles/files/84207277668.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/pesuwosezabogasena.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/vonorun.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wuduguk.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/43426744977.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/siluxoxobi.pdfIn PDF document text
    • https://2winit.com/Files/files/vivexudaf.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/85994313791.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/kutizefotibivizoxufogo.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/48437755905.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/11089420620.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pofebirefupokaw.pdfIn PDF document text
    • http://short-story.ru/upload/file/rapekat.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109091926553353.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/mobikezalelebadazev.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/rifeboxulolekodog.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091301094656.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109172015433469.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/nabodorudolebufajo.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/36653628349.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb0e6aa7cc3419c4a62acd67fb2ad7be/pirilefojedosumebiruv.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_off0000c5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 17784 bytes
SHA-256: 42a52a4854b4a28d5ef1f4a78cc02188d304781e4d04aee3a7d86b8df58c0146
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10660 bytes
SHA-256: 5962e38cdb25f5a883216387fc8bc54225fe736dc002053a304e0de3611a6b6b

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