Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a6b09fff7e1007…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 05:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d20127430236fee51b3297854898cec7 SHA-1: 12e8937b3da6a8f04fba0509dbb0271b381ab405 SHA-256: 37a6b09fff7e100798d3f81a866bef33f48096d62c82d8ab89d1c341d9478996
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a scheme to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://niszczeniewaw.pl/userfiles/file/70427650176.pdf In PDF document text
    • https://dintek.eu/uploads/file/44805786162.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/93992973283.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mulibodabikogel.pdfIn PDF document text
    • http://metzlerranch.com/userimages/68163598885.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388627161e---mufepive.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/sokabonuwafawisupe.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/30024868203.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/voburi.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/52501373126.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/ruzasilagix.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/sefarimimaxaxuteb.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/81274311355.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429469d0243---mojow.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/malikurugabijiduji.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/96962567159.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/wifadedadanobokasejawuna.pdfIn PDF document text
    • https://htchninc.com/d/files/todufomokajidifipunotir.pdfIn PDF document text
    • http://apicn.net/upload/files/79946580464.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/36134314297.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/gufuj.pdfIn PDF document text
    • https://kermanrooz.com/img/files/sawaduna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=comic+maker+for+pcPDF 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_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 10348 bytes
SHA-256: 4f22e149710770341e697c06f9020ebbb59a01e1927447748426bcc420902d59
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 17580 bytes
SHA-256: 24e731e7462cefadc2629c5ac226c4ab802be1272fc927d97e827a123a1bdef5

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