Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9a67b730bb24c0…

MALICIOUS

PDF

86.5 KB Created: 2021-09-10 10:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8735b0aa921b2c213b0a20af41d61e4 SHA-1: 9e8945b01593c5fdde4f1ee12ac8b429f0b4db6e SHA-256: ef9a67b730bb24c09f121994f3b6e1ce78ba912fe09a0a80908e41669418764b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable or potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to distribute links. Although no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection profile suggest it's likely a downloader or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allmassage.net/upload/file/20210903101805.pdf In PDF document text
    • https://rrrc.us/userfiles/file/botaxuxudisovukodeduwod.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/pifabilolusibodujo.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/22284870293.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/91639897498.pdfIn PDF document text
    • https://izr.fr/files/xepazatimamafid.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/52664996499.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/radorifikanoju.pdfIn PDF document text
    • http://techmechengineers.com/uploads/xominebaruvofuzori.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/64803237072.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/jutulowotiveselifaz.pdfIn PDF document text
    • https://kristinanamaste.eu/files/mawidolesiriforijabituvaj.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/xofosuzo.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/15190464688.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/nalubejepiwikapu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb8b1220c---xiboselim.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/nobome.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/72395361034.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sutofotadebizuzurejujob.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/pivamepajoz.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/7305478496.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/tusuriteronot.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/86150044165.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/gonagevaguworis.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/monimop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gx+tool+apk+downloadPDF 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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 20088 bytes
SHA-256: 7fe1505e8ed472fe9188c8596b610460284677f7a9cdf7baff3495b00b68753b
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 10212 bytes
SHA-256: c3f2f05cbc61ec27cba6736b07f2821cde8a3bf207cf977561ae239f06fb7233