Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7f8c5f4daa1d05…

MALICIOUS

PDF

84.3 KB Created: 2021-03-17 18:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 816fbf7cef09fed8f8417b8a8ba79e69 SHA-1: 505b5dbbd1e31e01206a238d626b62750dddbf2c SHA-256: bd7f8c5f4daa1d05337848baab9bbdb703a9443f52bf77e36e92fd55cfbd5d3e
166 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/award?keyword=alphonse+daudet+lettres+de+mon+moulin+pdf PDF link annotation
    • http://everydayy.fun/asus_m2n68-la_motherboard_manualfe5go.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/9hhkjes/40878813809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5ff25a01712d4.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/hhgcgfk/rularolupapezapuxoluj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_604735d88c60b.pdfIn PDF document text
    • http://meetporte.xyz/pearson_matlab_for_engineers_answersdfqlr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_6045f62b94c9d.pdfIn PDF document text
    • http://morpeoplelife.ru/how_to_convert_keynote_to_powerpointqby5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5ff5b8df1e63f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376869/normal_5ff5b099a2415.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/JGhhNd1/letter_of_recommendation_for_student_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_6019a4345a64f.pdfIn PDF document text
    • http://loginwithfb.site/veluvidetokunowic96kk.pdfIn PDF document text
    • http://azules.ru/485981061176xe02.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/mhbXUhb/11529871526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_320b33c6bd98459bba7728c2e9d51a9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61787c3e-a46f-48c5-93cc-486a2fa96a13/how_much_do_arbys_sliders_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b19d91-7c1c-4d8f-98d7-3ae122402da8/how_to_write_a_movie_script_in_telugu.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_49c90bf4ab564a5680ef765663eeeff2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ab3ba7-a65e-4854-bef9-8e561c9dfb0b/nisuwadavuzubirijev.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_12bf69442a374d379b88fce8a25da2b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c937cf-90bc-4999-b041-4495582987b0/how_to_make_shredder_lubricant_sheets.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_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 5268 bytes
SHA-256: 3968678c79004dfa4bb988d5b3159a99e4ccfbf328efdba06b9e4bf0f93f5964
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 13152 bytes
SHA-256: 99052da761367e28d5f3f4103b5f17ed6c5ef7446b8787adfcaa6f21adc06b14