Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c589176e1034c77…

MALICIOUS

PDF

83.7 KB Created: 2021-10-09 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9eae9a112de88828d73c3de34cde9690 SHA-1: 748343d78bb3c6edcdd63609e36b0d6f02941a19 SHA-256: 3c589176e1034c779e76cbde67c805a655c163bb3e885c39b121c33619840da2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://forspeed.cz/ckfinder/userfiles/files/pifibinawoxunuzuzax.pdf In PDF document text
    • https://yingzhaoliuart.com/upload/file/94392253084.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/76947191627.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bopunazarugewuxa.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/6949638856.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/warujuvawojevizetumi.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/zetuzojejorexor.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/66755317415.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/14196108970.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/75258254706.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee8b66c073c2292edd4cb25e3ebb2e4e/64388481451.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/64894474185.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/uvbt2sc5vd3porp3gretjnaif1/soxefujow.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/55371372243.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/degejavetizupena.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jibibula.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/jekuz.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/digoxotojoliniwebawosaluj.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/97484804877.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/65572926393.pdfIn PDF document text
    • https://onecre.com/images/content/files/geretaralojoveweverenomo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-10-4/20211004020417899385.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/93113207085.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/fuximobasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=signs+cats+have+rabiesPDF link annotation
    • 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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 10624 bytes
SHA-256: 457fad3de46afff61a73e12c45b935fda65da59ddb4b3a30753e6a4be707065c
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 18620 bytes
SHA-256: 92ea0a5ef50dc7832171e43c070918f24fddcbe73a046e0168d08d8778af39f3