Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05af044afee5ea3…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 01:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 059724adefa8cb639aeef518ef9223bd SHA-1: e652d197edb9632b0f0e381f47bdb444237448b8 SHA-256: d05af044afee5ea30091f19f240272b8ea07d47bbb148824b08b44104322049d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs, many of which are hosted on disposable domains. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it functions as a downloader or redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=stp+in+wastewater+treatment PDF link annotation
    • https://rsebolivia.org/userfiles/file/94936767561.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5269277559.pdfIn PDF document text
    • http://retailcop.ca/files/juvibugi.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/fegagilenawekez.pdfIn PDF document text
    • http://freeorden.com/media/file/32751868588.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/34127231080.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/saritolazagukixuwewimobe.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/98116984571.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/dewawovodakolozasirufa.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e35782f7---sofenigikigupepizunepux.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/93ca6dd52a0b7a3878713e9e30174850/guxidetomikogomapoj.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/97361560969.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/65426496256.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/59640393913.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/18010211029.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/48945076298.pdfIn PDF document text
    • http://eternoohydro.com/d/files/felatawudisarujiv.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/lemirej.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/kafidevigumik.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/83435469656.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/tewidemabirimorema.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/zulisigofamovikopadad.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_off0000adbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBC 16712 bytes
SHA-256: 3ac846870a97b4791bc6f5723856160256dc9a9b9b09f17fa76a132a6c2b0d1a
font_01_sfnt_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10408 bytes
SHA-256: cea812b0976f71f8e606ccbd09d2e192484fb314ae4c4cae351d7a1fb58146b4