Malicious PDF — malware analysis report

Static analysis result for SHA-256 310c92eed5314951…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 15:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d26bfc8d57531d5baadd20260f2a8077 SHA-1: 6d4507c6cc02d95d0ccb6d48aec87142846a067e SHA-256: 310c92eed5314951ae60a85cb3e63c401bf166171f70c0842da96572dbe04028
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=good+multiplayer+iphone+games PDF link annotation
    • http://pmrs.ps/userfiles/file/18349893916.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/ruxerosokarumitop.pdfIn PDF document text
    • http://rhondachem.com/d/files/tedukafasumafasujeliw.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/penopikajataxaxurasinonur.pdfIn PDF document text
    • http://lejuriste.ru/files/file/vofomesibujiwifobobusiko.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/8297667763.pdfIn PDF document text
    • http://rurisnet.org/images/file/95553222682.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/90831204659.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gagivamamax.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/60440566783.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/gosuwetibu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/migez.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/nipawojuguwelezaxos.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/vesulowipawulorevup.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xuliwawomelunasiki.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/bipikotazu.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/mirawenibemutavimuriki.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/094c4643ce9d5f52be46dc6274d3aff6/kosowubibowugokemoxebusuk.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/30664701440.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/zogufarowivivarikajojax.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/10654831142.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/28009568380.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/nixopegerijatoxudope.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/18939514668.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/75280077752.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/90715977595.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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 17728 bytes
SHA-256: 0f26a2211b40e54510f3da54fe2ad6a9e90508adf525a45bad4757f9d454204c
font_02_sfnt_off00012677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 11092 bytes
SHA-256: 9a8677efbdb3b916cce67c452c0dfa065c6f24e7ac8c7e9ce3edf91647435faf

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