Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a984e045fe519b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-01 03:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ebafa8b7e0565935b87d1d88a2bee483 SHA-1: 5d1c90d5bfb21461502db938bbb9090171139e0d SHA-256: 37a984e045fe519b8b897153ca976a58de82e07154c47d2d19b03944313c5743
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'leonvi.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm hosted on disposable domains, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites.

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://leonvi.ru/award?keyword=dictionary+english+to+english+free+download+full+version+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5ff8a3b86fee4.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/hwja1qP/dinosaur_wallpaper_for_bedroom.pdfIn PDF document text
    • http://viwavorikag.22web.org/77017234345.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/kexuri_wusovumigo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzikago/j1dtNxH/allama_iqbal_open_university_date_sheet_ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408701/normal_5fdd40c6bd654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_603be7e9e725a.pdfIn PDF document text
    • https://cdn.sqhk.co/nujamuxeg/AjeKib5/dropwizard_github_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fdc2c12463f5.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/KideBge/90304898008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60145e4e75515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5ffc2cbd6532d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_603e9a467ef81.pdfIn PDF document text
    • http://pejofewetoz.22web.org/arcaea_apk_mod_1._9._3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_602c77b2340f7.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/jeih8hg/star_wars_kotor_mod_apk_obb.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/56616.pdfIn PDF document text
    • https://faxemidarasagim.weebly.com/uploads/1/3/4/3/134341424/waforegovugo-wijan-wefezovijovolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonupov.epizy.com/iv_calculations_practice_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/doxitinovivonuropunidoza.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/39140534046.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/62306750606.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5668 bytes
SHA-256: d54ca3a4b1147ca2288d0ec790761ff57e9b84c27c2ea941ac20e98e9f81e882
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 11316 bytes
SHA-256: 2612171eb27501d34f235e2e6c1e2b1f18ae5f0f900b050dc62221bdf2a7f43b

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