Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d91305fb29d4656…

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 14:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3870b78597c36cfbf37768472283cd23 SHA-1: 0ee40e07266811443d432b21eb21983b9558652e SHA-256: 5d91305fb29d465641c9285ebe99cca8b20530bf2453deaa05fe363191fa2ea5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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 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://golowaki.ru/123?utm_term=tsb+covered+bond+investor+report PDF link annotation
    • http://dokazutulome.22web.org/atmos_clock_serial_numbers.pdfIn PDF document text
    • http://vofidiporalives.22web.org/da_jesus_book.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/9551170265.pdfIn PDF document text
    • http://zazutokanug.22web.org/electrical_commissioning_report_format.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/41464404113.pdfIn PDF document text
    • http://gogemupiru.22web.org/kadifigamirevi.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
    • http://wirizobesopo.epizy.com/ranunavarotanozolitirusu.pdfIn PDF document text
    • http://bidilud.rf.gd/vawebukedenazezajipul.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/fullness_elevation_worship_piano_sheet_music.pdfIn PDF document text
    • http://bojefej.epizy.com/aisi_4130_datasheet.pdfIn PDF document text
    • http://zadosaw.epizy.com/45991939624.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/zovejekonazoramo.pdfIn PDF document text
    • http://benamow.myartsonline.com/16838438212.pdfIn PDF document text
    • http://komoxam.rf.gd/read_the_adventures_of_huckleberry_finn.pdfIn PDF document text
    • http://lexafuz.epizy.com/vshare_ios_7_without_jailbreak.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 4760 bytes
SHA-256: ce1fdffd396900c2463e6f97d35dc804bc48efdbbd2e9ca7550fc980a3f7005c
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10236 bytes
SHA-256: 715d6b4ed845918c94cee0e646a1b3a84aa2953dc891b8769c4db6eef07ea473
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333