Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ec361c94bf9f58…

MALICIOUS

PDF

75.0 KB Created: 2021-06-07 00:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e25682d246b66e62d8210c91cbafa03a SHA-1: b01e480076be2184fd4bf0d6d99ead0c3f30f901 SHA-256: a3ec361c94bf9f58164f004fc273a5d93de67769186cbce90fa2a39e26b181d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=aathi+kaththi+naa+songs PDF link annotation
    • https://sanegirorasatu.weebly.com/uploads/1/3/5/4/135400744/fuvowijusijemi.pdfIn PDF document text
    • https://bigubiforuse.weebly.com/uploads/1/3/5/3/135389938/sipusukamup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_5fd78d4999e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_6043282ce99ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_600631c050256.pdfIn PDF document text
    • https://neliwoxe.weebly.com/uploads/1/3/4/8/134871618/a1a6a967ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_6044d46709721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5ff49668bd6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_603e38173d08a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_60633243c7ce4.pdfIn PDF document text
    • https://gafukarufigak.weebly.com/uploads/1/3/5/3/135309608/newaxinaxaliladit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ff1d53d56459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5ff9c75dcf51c.pdfIn PDF document text
    • https://fuburufogukedez.weebly.com/uploads/1/3/0/7/130776130/rufikutetoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_600e3a18f212a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betosaxugawi.pbworks.com/f/ledoperunizobugozes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf3af54-77f7-484c-ba23-8bfeee40738c/wosajugajegitanamefofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0235f8d2-3f96-4b07-8388-685cb41f414c/42188789664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3830a2b-0268-4692-82a8-93bb0f6acfdc/jakanupadofuvupabajobi.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144618756/67328437615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f12c2b-5f5e-48c3-9da2-766ff86cb3ff/lovisurotefadix.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144415500/bank_of_america_mobile_banking_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4987de85-d596-4f98-a042-77f421ea57fa/titulos_de_credito_introduccion_y_conclusion.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/what_is_vitiating_factors_in_contract_law.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 4872 bytes
SHA-256: 76b9a75f7fad157282a8cb1a6fe6e35fee8a4d7870dff80cfa8606bb7f854662
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 11420 bytes
SHA-256: dd9bfebf113e552d6f1652e2785b6b92c9ade1fd7166386c3c735dbd1d0eb09c