Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca39c4d977c2dd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 01:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 50d2576709ccab535b66442eb6a6d2ad SHA-1: 9992ec33cd2756671e188de4863aaae1666d1998 SHA-256: 41ca39c4d977c2ddcb7b614486afaf8102889abcd2641815175ef35bb2cc088c
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 0.9917

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://drafthe.ru/uplcv?utm_term=whatsapp+bluetooth+messenger+apk+download PDF link annotation
    • http://gryfarmerskie.pl/pliki_wyswig/files/86106848201.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/dudikurad.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/bikokixagelisedop.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/vumevogonaletafimuj.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/40263877250.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/31805295003.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/genekezusud.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/99127929152.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zutawodubot.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/kuxixu.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/95965762194.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/71521455307.pdfIn PDF document text
    • http://www.bash.cl/media/file/lewakodusuxiwumimovol.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/19276032270.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/gelegegotulezeteja.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/4816312419.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/21799158153.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/65417544536.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/neruwimigalivod.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/15386034170.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/difitamasuxenopi.pdfIn PDF document text
    • https://hse.tw/upload/file/fabel.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mojovikumabifomiwiwuzata.pdfIn PDF document text
    • http://popmetre.com/news/files/43267556146.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/79910054499.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/90922847237.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 19084 bytes
SHA-256: a1e41ca68e84762e29553823e5aaac29d1def896da646f5d45b0f54ba2cf6c38
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 11160 bytes
SHA-256: 073d567e220e17aa0fea081d881d9d781b7e3d1ab9135f5f49197e9c3acf8d56
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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