Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3ac3b797bed07…

MALICIOUS

PDF

76.7 KB Created: 2021-06-01 19:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef32a98a695f912fcf0c3f3d22c1c2ad SHA-1: df042defd2dab8ae29af17b87ee2f6f86e447a74 SHA-256: 3aa3ac3b797bed07c963878cf5e1197e1a63370286ba4712ac741e3ff19dd72c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/123?utm_term=brandy+melville+stickers+pdf PDF link annotation
    • https://sifelinapekaw.weebly.com/uploads/1/3/1/6/131637019/1ce41.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/0dac1ce220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485698/normal_5ffc39ee37ae4.pdfIn PDF document text
    • https://boralixaki.weebly.com/uploads/1/3/4/4/134479476/726842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5febb5e177859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/how_to_escape_hello_neighbour_act_two.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415035/97593780156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f8af58-6767-42b2-b367-97983402f5e2/25574305713.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/how_to_consolidate_data_from_multiple_workbooks_in_excel_using_vba.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/lutekavalogalafapudi.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_open_timex_ironman_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc8dc1b-5829-43f3-99b4-086f32c25db1/minecraft_apk_16.0.51.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af9b376-151f-482c-a014-245b25d1fd23/asl_non_manual_markers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56de98d8-019b-4d56-9349-90c3994845f5/2294728812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4cfcba-f5b5-4632-8c15-effe4a6966e1/pusubusotox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06ab869-8541-425d-9fe6-1009f4f5cc6d/how_big_is_the_average_vocabulary.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144421068/kivenabasepevuvobalex.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144424086/33844305011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c46f055-257a-41d3-a518-0219ae11a779/olivier_blanchard_macroeconomics_6th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0427fdc0-8efa-4840-a94e-7154eebc2440/elements_of_petroleum_geology_selley.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_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 5576 bytes
SHA-256: 33002f5c4cdcb6451004ea5c6c68d8be1720a11258cdbda54610805bc8d6acb0
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 10864 bytes
SHA-256: 3110b2e72e3190c530dfb989d55ff522af29c7ece99347b848874a76705dc9b9