Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4a91d23587211b…

MALICIOUS

PDF

78.5 KB Created: 2021-04-09 01:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4222b826cb1a21e2c1433ab4bdbb2fa1 SHA-1: 7d38fc85885b9634577be3e629928ebdf3480ed4 SHA-256: 4e4a91d23587211b970662cb266b5c84f31520d68a2622ce2a01a53c56c64791
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 0.9996

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://pelibifir.ru/strik?utm_term=waste+king+2600+garbage+disposal+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6030d36ed85e7.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/oNrxUgj/zamoruzupekika.pdfIn PDF document text
    • http://circus.market/gasudijijafa48vm2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_602d5e148a64a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_600b97f21dbdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fcaf887e7e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/yTLifhb/linking_verbs_definition_and_examples.pdfIn PDF document text
    • http://limons.space/golems_clash_of_clansogjhb.pdfIn PDF document text
    • https://cdn.sqhk.co/dexediwiboze/vjftvtF/like_app_videos_download_online.pdfIn PDF document text
    • http://rkconstructionsucks.com/manute4nnu3.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/LDXCjjh/teppanyaki_grill_for_home_kitchen.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/XBjjjet/comedy_good_night_images_in_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fdbbcd31bc5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fdfaea6689f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_602970b72ee07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_601830678d407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fe590314b86b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_a2889e2bf1df42cd8c62dd834df913a7.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_f52fb368deea45689b8ee1dffc26159f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fa245e-c2fc-4c65-b15b-289bda78d586/the_secret_history_of_hacking_full_movie_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34063807-c3b2-4c6f-8bef-b11e9f076898/adt_panel_says_cellular_failure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9495092d-42d4-458c-aed7-adaa7c99b018/helix_lt_vs_pod_go.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_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 5772 bytes
SHA-256: a411c53719f99444db7fa3bfd01ef0628cccfa918baeea7473c1d7ec5baedf75
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 10584 bytes
SHA-256: ba370bad185fa0af47df9df451f6f2a799002135e669b2fec4af6a5863457c20