Malicious PDF — malware analysis report

Static analysis result for SHA-256 33739a0c202e472c…

MALICIOUS

PDF

71.7 KB Created: 2021-01-21 02:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6fb5eeb3dc14ed75b3ee204211724e27 SHA-1: b546400b19e54379b0eb409a1590abbdc07b65a2 SHA-256: 33739a0c202e472c62a7aa4e64f24ea645a079f9c58bdb83998dc1736a248411
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/123?utm_term=bus+philadelphia+to+nyc PDF link annotation
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/5184027.pdfIn PDF document text
    • https://site-1178453.mozfiles.com/files/1178453/83432711522.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/bd562cd6a2.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/jbdicgj/helicopter_simulator_games_online.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/5057527.pdfIn PDF document text
    • https://site-1204510.mozfiles.com/files/1204510/milebife.pdfIn PDF document text
    • https://site-1178703.mozfiles.com/files/1178703/acustica_nebula_4_manual.pdfIn PDF document text
    • https://site-1177727.mozfiles.com/files/1177727/traffic_rider_mod_apk_2019_ios.pdfIn PDF document text
    • https://site-1175442.mozfiles.com/files/1175442/27148890429.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/54497.pdfIn PDF document text
    • https://site-1175525.mozfiles.com/files/1175525/converting_units_of_time_worksheet.pdfIn PDF document text
    • https://site-1227582.mozfiles.com/files/1227582/kexokijinizifemova.pdfIn PDF document text
    • https://site-1253273.mozfiles.com/files/1253273/dusaterujalugadulametisip.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/jjJuhjP/puvulonuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jomenuluz/fIihagi/silamuwadufoxaregujiwi.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/davobup_xopagaremiva.pdfIn PDF document text
    • https://site-1174921.mozfiles.com/files/1174921/70436343985.pdfIn PDF document text
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/toferapama-fulesopixaso.pdfIn PDF document text
    • https://fuzidofan.weebly.com/uploads/1/3/2/6/132695445/7729963.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jakujakula/sizol.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/49039859849.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/film_canister_rocket_lab_report.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 5216 bytes
SHA-256: 5c25cb7eb7c68f1e97789a9b1b1f06b78c08be670228bcbe817af19ac1984050
font_01_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 11000 bytes
SHA-256: ddbda45ceea049a4b8f12fae5dc6d51c282c58f2098d48129fc5bbf0469d9c9b