Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba079e08f30780b…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 09:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b59c78c115ce5759f3c34f089cb072 SHA-1: d215be86c11ec4bf72471911a49069aeac7464be SHA-256: 0ba079e08f30780baf8fd5a577ae52b4d011a11d034ad99afd4f29b780cb7622
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files. The primary malicious URL observed is https://jumiwimov.ru/wix?keyword=los+siete+espiritus+de+dios+cita+biblica, which is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=los+siete+espiritus+de+dios+cita+biblica
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/kugoditijevobesav.pdf
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/7790c4577733a.pdf
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/82672df0993c641.pdf
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/4645f92.pdf
    • http://vawokupe.iblogger.org/how_do_you_setup_a_true_metrix_glucose_meter.pdf
    • https://zesoxomilojul.weebly.com/uploads/1/3/4/0/134018604/poropesefefoxunipixi.pdf
    • https://xabetibupu.weebly.com/uploads/1/3/0/7/130738966/3b278.pdf
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/1f38cf3932.pdf
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/ab4b513763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lemitubelitod.rf.gd/the_big_lebowski_script.pdf
    • https://s3.amazonaws.com/tedowafomaru/leaflet_bahaya_merokok.pdf
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_4559b89e33254542bd26e5833a23df70.pdf?index=true
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_7e1a355cdf4447c5863d2f0539d0a8d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40f82a42-1d3c-4166-b6cf-be3ad172a694/how_to_program_universal_remote_to_fire_stick.pdf
    • https://uploads.strikinglycdn.com/files/1ef37868-87bc-4c60-9ab8-bf8cfaaf8a68/easy_pencil_drawing_pictures_free_download.pdf
    • https://s3.amazonaws.com/medaliwifufugel/beethoven_piano_sonata_no._6_sheet_music.pdf
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_6325c06c444647ee84405ba07bf1866a.pdf?index=true
    • https://s3.amazonaws.com/papuja/tinatofit.pdf
    • https://uploads.strikinglycdn.com/files/ed0be708-f00b-484b-a8b1-443fd1742f34/are_there_any_recalls_on_2008_chevy_malibu.pdf
    • https://uploads.strikinglycdn.com/files/f576f098-61c6-488f-a25a-0ee91df97689/promo_codes_for_dunkin_donuts_december_2020.pdf
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_6a9278d087d740bdbdfef7feb0dea7de.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f426.bin
496654f4d1e42e292f496852af1d6b37d015ea7a2afa626e594bdd88ec7b86ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 5148 bytes
font_01_sfnt_off000105ae.bin
8f633adb2f98dc38f1ed76874e43eb81de1cbf075871acdebdd34fa5ecab3bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 12000 bytes

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