Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77627c5ea8ccf95…

MALICIOUS

PDF

71.1 KB Created: 2021-03-11 03:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fecf4532c35d69cfa888a4850b1cfaea SHA-1: 8697e7d7b4f9393e7ce3c32104843076a52b2943 SHA-256: c77627c5ea8ccf95acfec3bed076f843e9f3e93236906b48aa24079a4d76b60e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm. One of the primary external URIs points to 'https://botokaw.ru/wb?keyword=human%20geography%20is%20best%20defined%20as%20the%20study%20of', and another suspicious URL 'http://kujamemapevuji.mypressonline.com/dukidorovufaselogawab.pdf' was identified as the start of a link farm. The document body is heavily corrupted, preventing analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://botokaw.ru/wb?keyword=human%20geography%20is%20best%20defined%20as%20the%20study%20of PDF link annotation
    • http://kujamemapevubu.mypressonline.com/dukidorovufaselogawab.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/feromudesasabozes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600b1c0857da3.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/bsc_1st_year_books_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5fdd24b4e5941.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/05d3189f1a7812.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/level_of_care_utilization_system_manual.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/angielski_dla_dzieci_materiay_do_druku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_8a8fa7d82b5c440392df209d9e5fa854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/zogokaguzavunum.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/malaikat_juga_tahu_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/bawarchi_movie_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/algorithms_to_live_by_audiobook_free.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_c286d78c379e450782875fae786c6323.pdf?index=trueIn PDF document text
    • http://kojenixerog.myartsonline.com/hp_officejet_pro_8600_plus_manual.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_9465663dab244cbd9ec62e1efd2aa1c8.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_f4a4a72d9ef244109f0e02e89ed2d090.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 5624 bytes
SHA-256: d116138f9c53fea6139751c4d64a2a1fb02d8d59ae7655a3dd82d4ba3530f8c5
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 9536 bytes
SHA-256: 8e228cdf9ef11621aacc515f51117be51179c70fabd68c996ae23297283c6087

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