Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b197579161f651…

MALICIOUS

PDF

75.9 KB Created: 2021-05-21 07:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 036623eba2b224640ea5a903361d76f1 SHA-1: adc19bf71a45def02f3046f017ed2afb7d655ded SHA-256: 97b197579161f651abc49eec9d25c48eb316bd98574d81215a7130ca9f3ea929
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to disposable hosting and redirectors, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic firing point towards an attempt to direct users to malicious sites.

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://botokaw.ru/strik?utm_term=perfect+verb+tense+5th+grade+worksheet PDF link annotation
    • https://xedukigujidazan.weebly.com/uploads/1/3/4/5/134512451/9743843.pdfIn PDF document text
    • https://gizaluta.weebly.com/uploads/1/3/5/3/135345368/6f6d415913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fd10e6f0526e.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/998a49f4fd1da.pdfIn PDF document text
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/fafuzofid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6006fa37821c6.pdfIn PDF document text
    • https://xurizuful.weebly.com/uploads/1/3/4/8/134898541/mipuruxolelidal_winufonukupa_kepetixuboz_seberuxukolexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ff899d9a6451.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/xalon-bodobipur-koruxuj.pdfIn PDF document text
    • https://luxisawevevolal.weebly.com/uploads/1/3/2/6/132682936/kuxejaboka-libavap-nebejuvaxisodox-xijusadekonife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_6027a7288eb88.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/73f65b2a-f3dc-4df4-b020-f79ed92cb741/para_que_sirve_un_bosquejo_de_plan_de_vida.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/rain_school_james_rumford.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/3588219587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bd634b-4c37-4c36-a9b2-8e966b57b97d/city_of_thieves_summary_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001be990-a51b-4841-b1cd-b981b374a097/what_is_the_difference_between_valid_void_and_voidable_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e8f36d-40df-4378-b3d7-8576229d5385/fipevobadape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c16307d-121f-4f20-899c-66cc972aa15d/how_to_change_dsg_fluid_and_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/80660450791.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 5732 bytes
SHA-256: bef5dba4ce2b42d9a7ae5107132fe554d540e0d5262de72027da75a981c73b8d
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 10980 bytes
SHA-256: d8075dc0a733fb9252bd4bd7bc3569932423574859eb5abda9ccf08407124279
font_02_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd