Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aa2fbeaacd3720…

MALICIOUS

PDF

105.2 KB Created: 2021-09-24 04:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ba76c0a170d931649c32462733203cd SHA-1: b46a1af21554982b9ef733efdf61be3f1753246b SHA-256: c8aa2fbeaacd37206c3ecf43b8d9b20b688b030b11a6ac87914c408aa655c0de
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the presence of PDF_URI and embedded URLs suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://baoveantam.org/upload/files/jitevasumoxurozokas.pdf In PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161491901884e4---89248255925.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/14158773757.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/48513136.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/riguvewopixi.pdfIn PDF document text
    • http://home-plast.ru/foto/files/65322760263.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sunodatok.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pasegejofejudolo.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912053338840575.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/fimupasadifefulebevisefe.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-19/20210919204925254308.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/bezowoferuwudibabufuvasi.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/bodalale.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/45435682624.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/42656868229.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3vvjp2lbubiiulomsc6qv8lhi5/56823379207.pdfIn PDF document text
    • http://195exim.com/datas/files/60684641857.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/89156990323.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/84642578230.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/madiku.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/xubekikanabodurozisepen.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/70734316355.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/kalofi.pdfIn PDF document text
    • https://cathita.vn/upload/files/legilatuvemonor.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/97540345517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chal+mera+putt+2+full+movie+download+720p+online+watchPDF 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_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 11292 bytes
SHA-256: 99f79f42a29ea15fa995912e356a35a97c47ae65696c8df916ece117f730e06c
font_01_sfnt_off00014aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEF 19388 bytes
SHA-256: 22df62e09b851b7c9632a7da83eb7377995d0b6b766d11aca8a9164425ee8ab6
font_02_sfnt_off00017dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1