Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f1922ace9f6259…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 07:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fb12b2a82829393f2a4cf2a42fc255e SHA-1: 094a8b85abe1555b17f0f7804a01ebb507e2903e SHA-256: e8f1922ace9f62594cc7859d7c2da0e9e934ea21a111f2859e947a38192809a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF contains numerous links pointing to a link farm, likely intended to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://acconpriti.com/ckfinder/userfiles/files/47362153770.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/lelexogaredazamolojux.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fotaluro.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/58540403959.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/melabalepebuva.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/47937224476.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/xogixo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/paganefapobal.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/61201792864.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/37943312011.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/reguf.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/zezokilazesuduxokamoxune.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/82443675218.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/dotuda.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/velotanexaso.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ee2b95b9---wapasuzijovagutitefuwo.pdfIn PDF document text
    • https://n-tlg.com/files/file/nawitewoma.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/28605857616.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/67125777670.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/47401180222.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/kugazujigafomasinarudi.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/84351875863.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/soxigenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=holly+hagan+body+biblePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 17412 bytes
SHA-256: 7808e13eb475c3c220a903c7bc839d1f238b5c042cff3004f0adc731bbcb670d
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10408 bytes
SHA-256: f23a194d5e5b9e45a6d46521b08bc35ef392bdfeeb8f861ebcb741b468db1a0e
font_02_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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