Malicious PDF — malware analysis report

Static analysis result for SHA-256 4845311be485c041…

MALICIOUS

PDF

81.8 KB Created: 2021-11-02 00:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97e0f336cf9fc2f67286421804bea201 SHA-1: b5a4673ec5229758f283ff9300e1e20893c5825b SHA-256: 4845311be485c041660ecd34357fdc6095d3edb9f37d87bde6b448adda5b3874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as a redirector on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=feast+of+immaculate+heart+of+mary PDF link annotation
    • https://rireenfrance.com/images/upload/files/9771680945.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/vopadetufuxaxuletatawexi.pdfIn PDF document text
    • https://betsin.org/userfiles/files/jexiwuvujifu.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021102112036654.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/13761530793.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zaludaf.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/buxugokefutuwisemebed.pdfIn PDF document text
    • http://toonesk.com/upload/45914314229.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/80344581137.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/lolinadotewujesi.pdfIn PDF document text
    • http://bdsductri.com/upload/files/lupeviradagozoxelekepujer.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/jeradokisojosojetekagufib.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/50374566711.pdfIn PDF document text
    • http://otczenacts.com/media/files/19311627097.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/44233123501.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/lufipojewasaguwun.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/vupidedaworirovufigul.pdfIn PDF document text
    • http://willbramephotography.com/76594752178.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/zexopijojuluritaruj.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/56269669226.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/lokinizagatakesisufudipib.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/3743697777.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/nopuxapobirilolij.pdfIn PDF document text
    • https://chilepools.com/contents/files/49887693040.pdfIn PDF document text
    • http://svx.su/ffile/file/39138590031.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 10688 bytes
SHA-256: 1cfdfa70cdee683ed9019c51d8f2c9ca4c06e3df184e05f00ba35c159dea1d94
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 17128 bytes
SHA-256: 8032693b022de426b2da2e7182b83e1a4139cae215d5878ad913e5982c374b7d
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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