Malicious PDF — malware analysis report

Static analysis result for SHA-256 c008e3fec2b3caa3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 09:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eaf8646e5af7d87e06e50caf90c07931 SHA-1: bfba9c9d999b0fa98cbd7973a1b28d35e8eff524 SHA-256: c008e3fec2b3caa34bc168d33f9f002ee388e713079a5d2b5b79e571a315abf9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into providing a password for an archive, a common tactic to bypass gateway scanning and deliver malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://karpzbeldowa.pl/uploads/userfiles/files/vapugotituxawekoku.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/62682541193.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/70907401856.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf2852efb2---kegizozedubesuvurarodobiv.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/43973475103.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/99505788227.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/livisi.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210903013348.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4f80b345a21ec942ba9b43e55484179d/65643391937.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea71c77bb9---vivonaximufasakifuligadis.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/jobenapikov.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/vuparidiwomisipuxuvafito.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/fupafufizajulavolarub.pdfIn PDF document text
    • http://www.puhito.hu/uploads/66311787751.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/37550720549.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210915_6E97C9C04429F810.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/62206759503.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/12182258252.pdfIn PDF document text
    • http://martonelektro.hu/files/file/mobixira.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kugewilunuvira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=happymod+download+gta+san+andreasPDF 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_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 10832 bytes
SHA-256: 974c68d7a62cd023f8f13faae0241b7013d4cd9771863b7dbcdee44bda365524
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 17616 bytes
SHA-256: cfe54b5cd214634cd22f4169001d9f5861eec8d60cbe70c09aff46be479d1b4f

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