Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5b4bb4805beda1…

MALICIOUS

PDF

82.4 KB Created: 2021-02-14 01:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 78b79e4c8afb22e2038cfe3bc69365b9 SHA-1: d2b3216c8cfb53095d4aa1fa609f14fadca5ed92 SHA-256: eb5b4bb4805beda18892340ee25e509bf0c42471966c8bc8e916bb63decccc2a
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic detections indicate it is a link farm and potentially malicious. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary IOC is a URL that appears to be part of a phishing or malware distribution scheme, disguised as a worksheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=vectors+addition+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/kixagixupo/VjisUvq/smashy_road_2_wikia.pdfIn PDF document text
    • http://boevoenlp.com/airline_tycoon_2_completo_portuguesu5obh.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/gfMjeO0/free_word_family_list_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/dstihsp/71052297272.pdfIn PDF document text
    • http://shopwithsale.website/renaissance_periodization_cookbook_free1u8y6.pdfIn PDF document text
    • http://powezikunuzumi.iblogger.org/91652572763.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/d7aXVRM/48876240290.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/ajisL9p/dungeon_defenders_2_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/5igxnif/duo_mobile_new_phone_purdue.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/iegiEvR/beautiful_dreamer_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/ijiijgi/auctionzip_calendar_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/PqOohap/64236869856.pdfIn PDF document text
    • http://table-wait.com/2044966533nfbvs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuterijoze/fokolikugorebusip.pdfIn PDF document text
    • http://lodonevubepivor.epizy.com/animal_full_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/lojavaruvizewokivan.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/aha_guidelines_for_anticoagulation.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/comprehension_worksheets_for_grade_11.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/bsria_report_structured_cabling.pdfIn PDF document text
    • http://dekijewawusex.epizy.com/vopifunuwubadi.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/5749218119.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/46814980612.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/simple_business_plan_proposal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 5120 bytes
SHA-256: b5964eb574f020433581701665c3a733069271318d3d493b26a89863757cf5d9
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 10600 bytes
SHA-256: e215a63421869cff1f20438c8f5a419330ec54cca4544d500b03584f2290514a
font_02_sfnt_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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