Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dd0e1aa2f08428…

MALICIOUS

PDF

100.0 KB Created: 2021-09-10 03:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 514514d9dcf1f14e6d964854c0f9c2e5 SHA-1: ad23c49575c6c559c113f7d0f209b0d5b3c38496 SHA-256: b6dd0e1aa2f08428d040ed0bc06700e0ba572acf386c14822037de99e127a851
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 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=how+to+ride+a+ripstik PDF link annotation
    • https://gonguyenkhoi.vn/upload/files/noxugunojexo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21599248668.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/9154622713.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/91163074362.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/tojuz.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/zetofopigumuranezaj.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/28969106152.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/vemamajevur.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/60302113373.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/15695721689.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/93446514605.pdfIn PDF document text
    • http://szjg.hu/images/file/fibufaxusovun.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/79649008367.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/detitalinojuwixiralomuzax.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/vapozulusoful.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pusezenapuzox.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_101551_118.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/wiwubalojipa.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/kogimoviwogexusijaziwof.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380e7793525---megatutawu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/44425915013.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139088437bcb---fowibuvonekimovebobinikir.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/42687791484.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/pejajalorividet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 10404 bytes
SHA-256: 674c625998dc8742f2208d2ce41ef46b45fcad7d0b403876521639d6229e6e34
font_02_sfnt_off000150f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F7 18836 bytes
SHA-256: 6b7b07a38018c364683166f5bf0136e503de0abd16f4ae63c5bf91d76343ee9c

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