Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d98edb153bd024f…

MALICIOUS

PDF

208.5 KB Created: 2021-04-10 07:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d8fd957b75d3b06d6593d4915284710a SHA-1: eb11b87d503300b2a4609636c99244cca51486a9 SHA-256: 4d98edb153bd024fc7963be19f31b68cb883f907ea5d1c044a9747716f50da87
156 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, specifically as a phishing trojan. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into providing sensitive recovery information. An external URI pointing to 'midufefew.ru' was also extracted, suggesting a potential command and control or phishing destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://midufefew.ru/strik?utm_term=reversing+secrets+of+reverse+engineering+github PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488604/normal_6062a69b468c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_60464e4f0b09d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6063824d3be3a.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/brady_bmp21_plus_manual_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5ffc582558127.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/why_is_there_a_jumper_wire_on_my_thermostat.pdfIn PDF document text
    • http://wuxevonatot.iblogger.org/bhartacha_ghatnakar_dj_remix.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/zetebimobezorave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452851/normal_60481c378a506.pdfIn PDF document text
    • http://funapuz.iblogger.org/addition_word_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fd81c5d60468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_602b62de2ce22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_604b5fda9004b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_74a89af5dff64fe39440530f9ddc2964.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/is_the_handmaids_tale_a_banned_book.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_276c813cf41b486f81f99dae73789452.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_1db752159e8d457d8c0c57542b4ac275.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/jipuzodo.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_2204e27cc5c249edb3448ea2b339aba8.pdf?index=trueIn PDF document text
    • http://repoguter.epizy.com/40548728442.pdfIn PDF document text
    • http://famojil.epizy.com/fox_fursona_reference_sheet.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_f006b96b0fc84156a0c988b2bcebc73e.pdf?index=trueIn PDF document text
    • http://juropap.rf.gd/looking_for_alaska_music_guide.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_off0002e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E243 5108 bytes
SHA-256: 0683841dda948084dd6cc162d4b14ec2a0d667f64c78e832920ad462e36fab77
font_01_sfnt_off0002f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3BB 12308 bytes
SHA-256: e2f0c3f7963c1c6a467ecf7096ca3de8ee4ca0c7119131aeea9a117cae5ace05
font_02_sfnt_off00031df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DF5 16200 bytes
SHA-256: e18df5d95fc844b341c64550dcc2228b1e6281eb964ddd261980e261679972cf

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