Malicious PDF — malware analysis report

Static analysis result for SHA-256 f823cbdef6e774d8…

MALICIOUS

PDF

82.4 KB Created: 2021-03-02 20:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed7d95b26e1d8075044eec7f9269d7fc SHA-1: 9a3c8559ad53d24c0d57c7a3bf5de5cb79a14c59 SHA-256: f823cbdef6e774d83ef0befd37220df5c680c7c1358348cecde043cb189bbfeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=constellation+map+orion%2527s+belt PDF link annotation
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/xuzuferejogariveba.pdfIn PDF document text
    • http://gsmall.space/convert_to_word_free_offlinegw1cp.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/minudo.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/optiplex_7010_drivers_pack07e34.pdfIn PDF document text
    • http://bemigovoso.iblogger.org/19647919275.pdfIn PDF document text
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/jigajeronagamini.pdfIn PDF document text
    • http://rubka.space/bsc_2nd_year_maths_notesanxzw.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/zusudis-gesizebume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/vabija.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/8172088215.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/31348873734.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/20457925107.pdfIn PDF document text
    • http://luwawabegopit.rf.gd/5152783852.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 3520 bytes
SHA-256: 41fefc65350e7b858147774c563af83d46f150331ffdb836d78c995ba349e5aa
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 5044 bytes
SHA-256: f9d699ddf72da05ab745e25b17591814075c9d6ad7b3f028be2a2eff70961a71
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 11444 bytes
SHA-256: d70214f52a9edc959e43a902801fa6a2c77443b862b3fb404fdaea1979b4fd08
font_03_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 16328 bytes
SHA-256: 8a45dccbe8a9eeaa0cb19de1effa55a46c147a65ac627f11a772d96d0877bf61

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