Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed956515d6fd5fc…

MALICIOUS

PDF

74.7 KB Created: 2021-02-13 14:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d93459c57755c00d45facb03e780491 SHA-1: a1643aefe180bc53ff7d893168e1a2fa000d82b9 SHA-256: fed956515d6fd5fc43e4edadd17189086ed47e2d23f945572bf0fde9a5ffb28b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://maypoin.ru/aws?utm_term=bhu+bcom+syllabus+2017+pdf', is likely the intended destination for malicious activity. ClamAV and ML classifiers strongly indicate a phishing or trojan payload. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/aws?utm_term=bhu+bcom+syllabus+2017+pdf PDF link annotation
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/pizorolef.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/gishdhe/funny_male_human_names_for_dogs.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/didegav.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/leropadekufixepu.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/algebra_1_factoring_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/gevolonovare/6CzibpA/juego_de_drones_en_espanol_pelicula_completa.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/ifnwVxj/74236732947.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/L3icjhu/clueless_cast_then_and_now_2020.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/nowafup.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/diwitapezu/currency_around_the_world_crossword_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/games_like_diablo_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/4284610373.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/46521132618.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/72926813265.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/beaconsfield_high_school_sixth_form_open_evening.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/loposowuxazeselifopabiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/hintertux_glacier_snow_report.pdfIn PDF document text
    • http://lekipuvuji.epizy.com/cwms_4._0_upgrade_guide.pdfIn PDF document text
    • http://bomatep.rf.gd/94023955038.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 5996 bytes
SHA-256: 03d97e7a25534fa20c61d111a55446035d4e472f72462e084b4584f3d4072ddd
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 9852 bytes
SHA-256: c740968efb9444a1bba920c70ad3d09a66ee29b8817c4daf912edc2bfc30fda2

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