Malicious PDF — malware analysis report

Static analysis result for SHA-256 840aaccc35beb885…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 15:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa0a2629f537513903bb2b49b4205a27 SHA-1: 2910f906e879f8a149f060e1e34c42cc879f45b1 SHA-256: 840aaccc35beb8854b0b06a89ef775ab5a0efa88b76b74e25a1453a53f65ac8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and callback scams. It contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious PDF files. The document body, though heavily obfuscated, suggests a lure related to billing or security issues, prompting the user to make a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://partnermind.cz/images/files/rululepikavusabozatisor.pdf In PDF document text
    • http://www.gesas.it/media/mailinglist/file/19411299003.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wagoxumulebifojojuxavis.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lilef.pdfIn PDF document text
    • https://izr.fr/files/19410507626.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/87864028689.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131f44c4babb---mulikavalefifugileguk.pdfIn PDF document text
    • https://badrivishal.com/media/19805791114.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/nelofexebivojanavoli.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/53421629086.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109101843156861.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/37585660272.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/xezoxuwa.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/konilazikozitenategozut.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/69819039505.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/74752774592.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/10876500690.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/85q0282cgns5t424cj6248c3ro/36518833782.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/tilurixaposakudarulaxipi.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/futomodofovoj.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/36835914763.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/94235668712.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/50170570679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+turn+off+mms+messages+on+androidPDF 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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 17704 bytes
SHA-256: 4567e06e27b2c44c8bdbe4578196ebe71b03c27497e7cbcfadb5d671424687de
font_01_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 10828 bytes
SHA-256: 24cdd27bbd3ee11dc08d4135189c48328ac9d8e8280189813447c7392f375412
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1