Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d4dcb28ea5e66f…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 07:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 09a983ce930bff3d1085813658e5e93a SHA-1: c13da686a4b67a37a2aeff28d62bb7e472f7dbc0 SHA-256: f1d4dcb28ea5e66fd029793e9035fdfcc6c3aa706db5b72754a94be4c041b128
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It exhibits characteristics of a PDF link farm, with numerous external URLs pointing to other PDF documents, suggesting a tactic to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the presence of external links and the PDF_SEO_LINK_FARM heuristic indicate a likely intent to redirect users to potentially harmful sites or download additional malware.

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/wix?keyword=the+busy+coder%2527s+guide+to+android+development+latest+version+pdf PDF link annotation
    • http://linavaluviriv.getenjoyment.net/computer_systems_analyst_degree.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/hhRogjJ/sports_apparel_brands_logos.pdfIn PDF document text
    • http://vosusapar.22web.org/32345428452.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/best_powerpoint_templates_for_business_presentation_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bosareke/Q0Yjghf/2048_cupcakes_reverse.pdfIn PDF document text
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/fiwimilul-fetilami-weneme-pexulunovur.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/3xolAgg/the_crossing_church_las_vegas_facebook.pdfIn PDF document text
    • https://suxaniwaxunese.weebly.com/uploads/1/3/4/3/134385499/jukusipuzaba_newipuvejali_wijefazasuka.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/ea820b3c.pdfIn PDF document text
    • http://gomakugagazeg.iblogger.org/1006917728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/putelekireza/15450680991.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/how_much_does_google_play_books_cost.pdfIn PDF document text
    • http://ladisopezaxak.epizy.com/45618133074.pdfIn PDF document text
    • http://jekidosokun.epizy.com/nutrisi_hidroponik_organik.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/50907481558.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/fejoxedisagatuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5736 bytes
SHA-256: 187b3b341bae75a6a791f1431b7fa97f895f351d4bfd5d460673fc80b013f15b
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10240 bytes
SHA-256: efdf3c65b8039f0ce9aaf5795b975c9841e5c37d0273659ea569602b9b0ae9d4
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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