Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aa42327707c1ca…

MALICIOUS

PDF

80.7 KB Created: 2021-03-15 11:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ad5ff79438424f0740c155bf93139b2d SHA-1: fca7c22eaaeb488da5d74631ad6f616e873d9156 SHA-256: a0aa42327707c1ca5bcd015822826a4d6cf119f011c7ab5c87e2b6497816a054
126 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 or trojan variant. It contains multiple embedded URLs, with 'https://maypoin.ru/award?keyword=google+docs+to+pdf+iphone' being a prominent example that suggests a lure for users seeking document conversion. The presence of numerous links and the heuristic indicating a link farm on disposable hosting further support a phishing or malware distribution scheme.

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 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.
  • 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/award?keyword=google+docs+to+pdf+iphone PDF link annotation
    • http://felesatediz.medianewsonline.com/22252660454.pdfIn PDF document text
    • http://winsl.space/how_to_update_amazon_echopc3wa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5ff864dab0876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fd26e628dd16.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/mudasolupigewixepat.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/reading_comprehension_test_grade_8.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/que_significa_avaro_segun_la_biblia.pdfIn PDF document text
    • http://udilische.club/dofasvyc6v.pdfIn PDF document text
    • http://timinome.getenjoyment.net/3706338708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8de5bc0-f85b-4ae9-ab6e-9d673c05d488/installing_bosch_800_series_dishwasher.pdfIn PDF document text
    • http://pusitarise.rf.gd/punmia_building_construction_download.pdfIn PDF document text
    • http://jerefivelav.epizy.com/free_kindergarten_reading_fluency_passages.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/62070005014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ff2cf0-adee-4d00-b618-4447c3a56a2f/le_mythe_de_sisyphe_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/zelda_links_awakening_switch_strategy_guide.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/old_tv_serial_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/john_deere_tractor_plowing_snow.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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 5144 bytes
SHA-256: 5b783f106adf6efcf3f28dc3e2c8c666720913b863539e2aad3d85041ca08276
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10612 bytes
SHA-256: 1e07822ed285de4bfd44c8ea7804cc9bfaed50b35f1a1c875bdad1b3ff4c4f6f
font_02_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 16388 bytes
SHA-256: 0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7

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