Malicious PDF — malware analysis report

Static analysis result for SHA-256 be760925d69aee06…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 06:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 27f55d6fef4764f524cbd76d296a95b0 SHA-1: e6adc61674023e1d3340d2b091488902577fbf0e SHA-256: be760925d69aee06e80cb6c383d5ac7503e2944353e194ecc642bd154bf1e90d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/award?keyword=calisthenics+diet+pdf PDF link annotation
    • http://roselosudeve.sportsontheweb.net/lowrance_elite_4_hdi_prix.pdfIn PDF document text
    • http://copyrightmediahelp.com/67834609264zs2l5.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/alchymista_coelho.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/fY86Zqb/equalizer_music_player_booster_apk_download.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/swot_analysis_definition.pdfIn PDF document text
    • http://prolac.ru/antibiotic_prophylaxis_guidelines_after_joint_replacement693ac.pdfIn PDF document text
    • http://sunshop.pro/xibuwojifideko222w0.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/bgp_interview_questions_and_answers_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_6047cf46b2139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_60312d257ee4b.pdfIn PDF document text
    • http://okstore.info/what_type_of_questions_are_asked_in_llb_entrance_examjavcq.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuwusogoxo/HKTv3gi/addition_worksheets_no_regrouping.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/tojod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5ffc86c14ad9f.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/egggeDi/download_shred_downhill_mountainbiking_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e03a3e-0b05-4b77-a236-de23d5678097/lamborghini_huracan_2019_preo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5959a1b3-ff34-4744-bc52-9ab8547a613e/harry_potter_book_1_chapter_8.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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 5052 bytes
SHA-256: a51c30c2c71474c9b1fd881f42421d1ba4a73cc58a150091cc5e7a6eabd71fac
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 11312 bytes
SHA-256: 0093439c5bf9d789d3280fbac6db4e9762f9f22e21d3e7fc649a06e820627dab

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