Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dbccebbd7c6a45…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 12:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e2773d16e4ccf18cde568a91c3779ed SHA-1: fcb2c0697db4a643b24c238fa8db063d740dac60 SHA-256: c1dbccebbd7c6a454d54f7ecb6b0d1b4cadc32e7906104e2ef81ac1f07275fc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aspirans.com/files/file/pujaxowib.pdf In PDF document text
    • http://tce.vn/imagesflashupload/file/sofebine.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dosofefejodo.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/93585982339.pdfIn PDF document text
    • https://0900107678.com/upload/file/92120210037.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jewedarumuwabo.pdfIn PDF document text
    • http://stattus.com/assets/file/58265378069.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210905/file/birobebomikoko.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905205349.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144506348ab5---63098908091.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/48664227523.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/88762715887.pdfIn PDF document text
    • https://kokomanis.com/contents/files/83433134475.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/5826693182.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/lisawekiwedinunowosolewo.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/rumoviguzaru.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/73199075766.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091410045073499.pdfIn PDF document text
    • http://contextuae.com/resimler/files/75568798546.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/dixovo.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/93030124992.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xabubapigulijo.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/13877404168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+iphone+games+no+adsPDF link annotation
    • 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 18648 bytes
SHA-256: 42eb170e7b6e5d1dac0cfadcfe014312d0b4c3d79e6f1b45cef7fe3765571bbe
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 10744 bytes
SHA-256: 157a5d2ffcc696c572a0eaa5d44ed92d706ada1f9a759c54d75ad463e8663fb3

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