Malicious PDF — malware analysis report

Static analysis result for SHA-256 505d9d52310e608a…

MALICIOUS

PDF

69.2 KB Created: 2021-03-25 02:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57b7fff10438269f081d2f52f491a2da SHA-1: 574188a907c8dcfca5e2490525502f59f3507fae SHA-256: 505d9d52310e608a0b63a542e71c020785154bc4bcd45611c28a0f8c17cf10af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it is part of an SEO link farm. One of the primary external URIs, 'https://seumenha.ru/award?keyword=white+christmas+chords+pdf', suggests a lure to a website that may host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=white+christmas+chords+pdf
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/534ec1de514b3.pdf
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/4671242.pdf
    • http://vumajufeboxidik.mywebcommunity.org/how_to_make_mini_paper_stars_easy_step_by_step.pdf
    • https://xetodalu.weebly.com/uploads/1/3/4/4/134458353/2010037.pdf
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/pipavotup_penuxunajedato_ninatogarebov.pdf
    • http://tanubujurutemut.scienceontheweb.net/vonuxadilufujuwosekeger.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tutapaxi/boss_movie_telugu_video_songs.pdf
    • https://s3.amazonaws.com/zonebon/gexaw.pdf
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_8006938c37cb4d8fb6b525653a47a45c.pdf?index=true
    • https://s3.amazonaws.com/wivunonovef/shree_krishna_bhajan_audio.pdf
    • https://s3.amazonaws.com/nitizobuv/beyonce_irreplaceable_free.pdf
    • http://desujiruvomeb.myartsonline.com/sociology_books_online.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_4318ef00d3c945a6b66fd596284cb251.pdf?index=true
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_c37fe22fe9104a789f6b9eff95b9af75.pdf?index=true
    • https://s3.amazonaws.com/buponuwebi/rufozitajuputedotiwo.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_db38c9cb638b41c9931bc2e85dfc48c8.pdf?index=true
    • https://s3.amazonaws.com/debiwelof/rational_fasting_book.pdf
    • http://vegubom.atwebpages.com/topol.pdf
    • https://s3.amazonaws.com/nefunupu/xezizolinen.pdf
    • https://s3.amazonaws.com/fopalew/56250755611.pdf
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_05c11838f05d49fdaa0339a2a0ca5d3c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d251.bin
a35e0c773b3d78cf295c1edede48c298ddbb8f088a7e67c9b924d56f5c6a7e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 5376 bytes
font_01_sfnt_off0000e47a.bin
12c4071baee153265e4df5466d336744f76b0f856a61868ab12bee3ae7153c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 10388 bytes

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