Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8cf7e78ddf6cd8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 10:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 860503f3393a5ddec65d804d3b0a9c10 SHA-1: 117c5e0289f18a94be3ec777e98fdc92bc392216 SHA-256: 0c8cf7e78ddf6cd8a511e4676646cc27697456e282dd9c2da16b5de019bd2073
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=how+to+turn+android+phone+into+hotspot PDF link annotation
    • http://ippinnudon.com/uploads/files/24594478493.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/ramudubiw.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/zariro.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/44903149118.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/pimawutejiwoge.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/fubuxat.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/muralejojobodesodi.pdfIn PDF document text
    • http://fgosvo.ru/files/files/sofukibu.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/mijaxoburasi.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/kobiwivat.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/45209462582.pdfIn PDF document text
    • http://mutitar.com/user_img/files/22883183904.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/74197070003.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/70281525948.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/48880791596.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/zutiguvagolafanoxab.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/24715323532.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/wikujugunavunake.pdfIn PDF document text
    • https://kawanmto.info/contents/files/95521004766.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5cd51f9c777ad2e38aee5bffdb82d53c.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/takenemugavetijapamusi.pdfIn PDF document text
    • http://ausafe.net/images/art/files/kujeposigijerexogitapu.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fikunuwobemize.pdfIn PDF document text
    • http://serting.eu/userfiles/files/rapigageremufuvar.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/bibugufarumogoke.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/47667655510.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/90187082166.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10620 bytes
SHA-256: d9649c45ea92a19c0ed21d1531b79a4f88a2533555e069cc9731ef88f78c6b6f
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 18380 bytes
SHA-256: 2cfb0d1e6e440126855c450b3b3ab449aa9df4f8da6eab1776e2ca18ed0e78dc
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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