Malicious PDF — malware analysis report

Static analysis result for SHA-256 f509d35195ac7c65…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 16:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc39358878eaf95bb5568511175601a3 SHA-1: 93af7f1af18210d980dfd0417903ec8c8d249824 SHA-256: f509d35195ac7c65c2b7ffe9fcd672c3b237bb9fbf7147dcedd2c60f8962bad6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, and a heuristic identified a deceptive download button. The presence of these elements suggests the PDF is part of a phishing or malware distribution scheme, likely attempting to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613030ef8c827---23234146974.pdf In PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/32107124269.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/46128071802.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/dotigimokawiwodetagap.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/9536786698.pdfIn PDF document text
    • https://izr.fr/files/xepazatimamafid.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/romupubesuxujujavugex.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/28529006492.pdfIn PDF document text
    • http://showdoimovel.com/files/files/50448639388.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/xowane.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/11881471097.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/tutogog.pdfIn PDF document text
    • http://medica-brno.com/files/99506539447.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/2414652180.pdfIn PDF document text
    • https://melz-feu.ru/upload/60808396573.pdfIn PDF document text
    • https://tomas-music.com/contents/files/8927227232.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/18360880922.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/67450300164.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/5093956943.pdfIn PDF document text
    • https://iohrp.org/f_files/files/darovolifi.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/30927296435.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lt5urnojn4et21enh4hivs7535/81200123071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amplitude+modulation+solved+problems+pdfPDF 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_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 10944 bytes
SHA-256: 8ec8c6f319c4e666750eae231c45a61224cac0d6d95381bc1dfd5fa370c5dd1e
font_01_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 17964 bytes
SHA-256: 23939a7e2c421dfcd3c42f7b4504ed4322523d283b949beb571f43a7728e3867
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1