Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e68c398d4c63863…

MALICIOUS

PDF

91.2 KB Created: 2021-04-01 09:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 94c571f56e115b5f4c938c5385d5ce74 SHA-1: 7f04de4fed96ebf8a8944c3294f0ed205026ee82 SHA-256: 3e68c398d4c6386389dc9a850b31548cf02b403e2e709ed03299ab72dd490276
166 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and uses suspicious links, with one link being invisible and leading to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to redirect users to malicious content.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/award?keyword=15+days+practice+for+ielts+writing+general+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5ff531308674e.pdfIn PDF document text
    • http://domsale.xyz/57257504721uujvh.pdfIn PDF document text
    • http://canonsburglake.org/sql_server_express_2012_with_tools2i2w6.pdfIn PDF document text
    • http://blockingscenery.com/delonghi_pacan125hpec_instructionsyn48j.pdfIn PDF document text
    • http://itprod.space/the_minister_s_black_veiljtmw2.pdfIn PDF document text
    • http://ig-supportcenter.xyz/17432731496xwbqu.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/42089936257gha0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_6037128b0fcaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_6001144574f1b.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/lista_de_las_cualidades_de_una_persona_autonoma.pdfIn PDF document text
    • http://shoop-fg.ru/first_grade_grammar_worksheets_freettkjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_60300c7b9d1c1.pdfIn PDF document text
    • http://healthytrands.com/korabubans9ka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_605d75753d5bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futebowa.atwebpages.com/15172812128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af542557-0433-4e54-993a-aecb7a365970/parabody_350_home_gym_workout_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b377b9-e14e-45c0-91a8-290f08a6dc78/lijaxirazedekeponuzo.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/summary_of_the_bible_from_genesis_to_revelation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d17d36-0c60-460b-9649-a798a4f191ee/dufunidikutazozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e76baf3-5b25-499b-8c85-39424636bda0/4261242909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157bb0b5-cce5-47bb-b08e-086cb0be7859/how_to_reset_digital_stream_converter_box_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9f185a-e7c3-436d-a1fd-2de21215ba26/surah_mulk_translation_in_bengali.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_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 5600 bytes
SHA-256: 52b98ec3a01b549224cde85486997a796343e2c65294c57b57337fb6b99d114e
font_01_sfnt_off00013830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13830 12000 bytes
SHA-256: fa990e986191d83ede9d69d921e96ca681917e3dd24a7e2f403e4b6f3b140a7d