Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2185966b86552c…

MALICIOUS

PDF

88.2 KB Created: 2021-02-22 08:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f4a4984919c8914a06c70897c17396a SHA-1: d0d477b92afa7eb04cc9b20f718a4db313d4e6ab SHA-256: 3f2185966b86552c02fbbd551ae3617a3902a14607e639d3f4b851c3728859a4
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://crophysi.ru/wix?keyword=walc+%25282-9%2529+free+pdf PDF link annotation
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/lafejuzava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fcb1da5f0d4e.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/vijelurofex.pdfIn PDF document text
    • http://love-your-lips.online/55247545172wf0n8.pdfIn PDF document text
    • http://gnatural.space/windows_10_lock_screen_location_infoka23q.pdfIn PDF document text
    • http://repaircreditscore.info/wizibegair6nj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ffa35151a11e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_6029cbcde4b68.pdfIn PDF document text
    • http://wegansit.space/lorupim0mmk9.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/zorukazetixevi.pdfIn PDF document text
    • http://photoforce.ru/moores_clinical_anatomy_free_downloadwhbou.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fd931d7e9d53.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/hiahfYh/24128399886.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/7jhqHhe/space_wallpaper_4k_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd6a0cd4fed4.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/sixenogafopoj/zegedoraxamet.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/bestwap_bhojpuri_dj_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/91473148455.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/24550977591.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_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 5460 bytes
SHA-256: 528dc0de29201a3e938b662a5a184d1956ea576f3ca1977bb9e3060c994587b0
font_01_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 16800 bytes
SHA-256: 4e61052f74270c580c0b81cb6fd961379f0f77c5800ce0ba42aa7592c1e2e2e9