Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7fed66f96ae458…

MALICIOUS

PDF

88.4 KB Created: 2021-03-25 00:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 33918447ab3bf39fc0adf1b97c980a58 SHA-1: 0e80fd6852606316191afa2a2337ba7c708d4580 SHA-256: 1c7fed66f96ae458bedb00113817ffc3923920d0b1e5c3a843ecfe678821c44a
134 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 external URLs, many of which point to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational materials, combined with authoring metadata that is likely a cover.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/award?keyword=ncert+physics+textbook+class+11+part+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485010/normal_602b34e4f3a16.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/canara_bank_cheque_book_request_form_download.pdfIn PDF document text
    • http://vkrowl.com/30332926883xcs72.pdfIn PDF document text
    • http://teasmall.space/961579344105f44l.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/xijipevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486522/normal_5fdfa76d5feb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5ff8da81a486b.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/john_deere_265_parts_manual.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/concise_paediatrics.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/additional_mathematics_form_4_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_603c6e59f1601.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/50591052493.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/annuities_notes.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/celtic_influence_on_english_language.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5ffbcae218f3f.pdfIn PDF document text
    • http://itslm.fun/acquisition_of_citizenshipsd4qv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_5bac8e2170bb4a6098f3173364c00d7e.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_3dfa4d02551344ada24c9c44571494e3.pdf?index=trueIn PDF document text
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_9ad29ce774684d72afd3cada51381e65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/bosch_tassimo_t47_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/23513302980.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/jetodisiniwasupokegit.pdfIn PDF document text
    • http://juvusowupu.onlinewebshop.net/beacon_house_window_of_tolerance.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/92428960641.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_3cb4b3848f3a4a56b4bbc30e58cf4314.pdf?index=trueIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_f1e87870ecfb4a158b9a7f08a81206ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rerinago/universit_aix_marseille_psychologie_formation_continue.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/62328699204.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_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 5768 bytes
SHA-256: 1c3c21f65424f6a082b2926bae586448a08afe06dd82efe030f2d34bdc6a79b1
font_01_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 10752 bytes
SHA-256: 17937e02deaa191fe3222b69154b14e1692421d218eb33fa663f74ab3d31222c
font_02_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 3280 bytes
SHA-256: 665522fd418043db4cf508fac59e4d6cabd0527648667f0190fd7112f56f0e1c

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