Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ce23e21412abb…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 16:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f58a567bad50b1898375f0bc999cffb SHA-1: 1f61b5e9eb90a95e137f15018af22edd4869ffba SHA-256: cf3ce23e21412abbde721eb20b56061e79fb2c5691a6bb5ba559a131dc05f8f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external URIs and is structured as a link farm, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links suggests the PDF is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=fliz+movie+app PDF link annotation
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/jopejusapemo.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/wuvoruwag.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/52765581171.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/vosumabanolerevi.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/lokavuwumulonikisajebodu.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/bujiremi.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jogibanofufo.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/54921447197.pdfIn PDF document text
    • http://1carl.com/userfiles/file/ligudujobizuseboforu.pdfIn PDF document text
    • https://renewone.de/files/85304576331.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/47693808002.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/43184068038.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/18703045854.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/77322148610.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/bakobarezotariru.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/58765607257.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/bibege.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/tozidiburesawufi.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/gajonuzopewafotamaraf.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/suseru.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/zefowaxefisober.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wowojutapubu.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/82425791104.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/noxozalademaxatotukafak.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/64696551351.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219122563784.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_off0000bba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 16944 bytes
SHA-256: 33809000216f01116072fc7b29dab5e19d714ca52498d589231326d07ee70453
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 10048 bytes
SHA-256: 0e593e52256924fe544ec4551b98307cb3363f905b60e852206c07be1817ff8c

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