Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ff61313f55387e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 01:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3f25f9a55bbb841fc9b64dc021a3bceb SHA-1: 9c774c7fd69e3de9e19ecb53cc6396c8c0d97abb SHA-256: e8ff61313f55387e8c1aa0a2fa0e5fd7952f601737159629dc5cdcfbf3507331
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to phishing or malicious content. The presence of external URIs and the ML classification strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=6th+grade+math+curriculum+pdf PDF link annotation
    • http://lnstgramhelpcopyright.com/603737459881fxdq.pdfIn PDF document text
    • http://cetapp.xyz/36374516394r6kea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_6019f9829898b.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/teaching_approaches_in_music_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/jhiihcz/19164351333.pdfIn PDF document text
    • http://copyright-supporthelp.com/gokekifimo7kwcw.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/ehfjfjf/racer_1000_for_sale_craigslist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6023dc444dac2.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/drTh2jh/my_ghost_girlfriend_anime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_603eb4b788177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6039c4f27e8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_6022682093fb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/64475716707.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_8d9a883e065e44a6b7e6a01a593909b8.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/schlage_keyless_deadbolt_wont_unlock.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/roman_centurions_753_31_bc.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_cc28c027b26b46559d74e62c2223a226.pdf?index=trueIn PDF document text
    • http://pekafujojef.onlinewebshop.net/african_wild_dogs_eat_human.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/dd_5th_edition_players_guide.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_cc588c2171e14c7895b19834d1c77a16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/cmore_hits_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/25997956063.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_2ac5013ee70b481e82617b045630715f.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_92a4f032e94c4c8481e800f9ad72f9e0.pdf?index=trueIn 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_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 5452 bytes
SHA-256: 4e313735985341957afa9f281b18658a1d8e06fcea82c61e08aa4447ae93cf09
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10740 bytes
SHA-256: 7ca65d365ce8770c4005477e89524ec3c36c1b9a0fef95915a2356a7d816bc8b

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