Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c4688a27c720d1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 10:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4fd2479558e8ef833103a24bdc8d3f9 SHA-1: 8fbe716fdc7d09958b0f64746b5290b22bdb9050 SHA-256: 62c4688a27c720d1a36043b9ae92d22e398800fae55bbe072d440d623bfa3cdf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to contact a number for fraudulent purposes. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content or initiate fraudulent communications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://0286869143.com/editor_images/files/87212052380.pdf In PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/foxelurajuxisare.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/mawevoxowopubeponarelab.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae246f1b6---wekosop.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/tibaxudopotexefidixopipuf.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/79665416856.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/29874232484.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/1421348098.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/busikowelom.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/2601659935.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/kexabakuguvigawilu.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/79024265751.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/refofoxop.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/kitupimedoripufodo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/14068480122.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/1746824819.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/kixekigojodoxaja.pdfIn PDF document text
    • https://mackbeks.com/files/file/minigurowisudularerewabij.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xelevopenubanopigaxinil.pdfIn PDF document text
    • http://marine-inox.com/i/File/ranevediv.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jivoje.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/gisarom.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/83296310015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+do+a+live+wallpaper+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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 17288 bytes
SHA-256: 757dc6642817e964582b134d56d3d933af720ccc3fdefc42825c4b8897c6fdc3
font_01_sfnt_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 10360 bytes
SHA-256: ef57155a0e1555a150f8ffe99f93904790de28a659c1541b967f5db3a4240e90