Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c6dc67769c9b1f…

MALICIOUS

PDF

72.0 KB Created: 2021-07-12 21:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: addc3fa7b9c0190675bd5e3099af7129 SHA-1: fcd3f9bec08a6e8dc1e8a001952ece6715ad5975 SHA-256: 46c6dc67769c9b1f9fd6e47fa5d210277dac697c1e1ba14e1f0d3dee02a17677
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URL that, while currently flagged as benign, is presented in a way that suggests a phishing attempt. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2209

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://feedproxy.google.com/~r/sq/ugae/~3/pL_UGxDroB4/square?utm_term=nursing+behavioral+interview+questions+and+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e77512903cf451be71ed66/1625781522788/quick_easy_croutons.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e81e69a3609a707baed273/1625824873321/zepezofexidedefemubega.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://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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 11044 bytes
SHA-256: d14a38038f42fb37f6df2c5236ef5841b5ac1e7729b737257bd176bdf6043491
font_01_sfnt_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 15212 bytes
SHA-256: 390f3029e1adce33e5f4070372869e32974cc7ceb18ab2ede83295c4c070aeb9
font_02_sfnt_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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