Malicious PDF — malware analysis report

Static analysis result for SHA-256 03103ee7a8374f21…

MALICIOUS

PDF

87.0 KB Created: 2021-04-08 06:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 472b1796bed9c8b9509dd4cadcd23980 SHA-1: 7e1bff4fbaf6d7e19ff196e6b3062e15d8c52cba SHA-256: 03103ee7a8374f2101dcfc131724ecff68faeeea044a7826ff785c0647022f25
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a malicious external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the presence of multiple external links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=antibioticos+en+cirugia+pdf+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453326/normal_6032cb4003354.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fec9559c3946.pdfIn PDF document text
    • http://pewawivir.iblogger.org/98321331386.pdfIn PDF document text
    • http://vudomafetamadig.iblogger.org/desumumagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6067c7b27e161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satuwegalenez.epizy.com/automobile_history.pdfIn PDF document text
    • http://zonidagaxa.epizy.com/birdland_paradise_mod_apk_revdl.pdfIn PDF document text
    • http://naxelekifomo.rf.gd/lupuvakonoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb0462a-c741-4b3b-9f73-e6f31890a82e/66502278583.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_d8466a8058284e0e82487d28cc78387f.pdf?index=trueIn PDF document text
    • http://pevibizedafi.epizy.com/bpsc_sociology_optional_question_paper_2020.pdfIn PDF document text
    • http://nukixoxekixos.epizy.com/metodologia_aprendizaje_basado_en_proyectos.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/the_7_spiritual_laws_of_success_by_deepak_chopra.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_47706eb4d51d4b8880da7038fdcf45bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfedb635-0503-45da-b24f-d078a8922d49/how_to_factory_reset_lenovo_t430_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddcd60e-17f5-454c-8498-dd6118fa9611/long_john_silver_nutrition_info.pdfIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_4633d2d2f9f844849e1afb520cde389a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jimugivos/what_is_on_taco_bells_happy_hour_menu.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_165f95445a254ea7a4779e381ebd28e3.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_c195da3635a44e64a4e5b974290b2776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/bevufawogewefolipemudowad.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_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 5940 bytes
SHA-256: 06c7054de46a91db2c982175aa9abca76428502a8ba5c9ac285a240cc1409a39
font_01_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 11620 bytes
SHA-256: fc57557727934b3025424bf00425cd48b54a9740baad3e0754167d019d9ef01e

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