Malicious PDF — malware analysis report

Static analysis result for SHA-256 854bedd1f7cbebad…

MALICIOUS

PDF

73.1 KB Created: 2021-07-15 09:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7f94921a966ee9f95045f9087a49de SHA-1: 004e7bbb035455b513728785e92d842fad63edb2 SHA-256: 854bedd1f7cbebadda23dc8b708b373c1a5c638f7fc9ae2c0d46b1742f5ab264
96 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 presence of embedded URLs suggests a phishing or malware distribution attempt, likely leveraging the PDF as a lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user interaction to navigate to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8315

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/v-xubMviL4Y/square?utm_term=thought+in+tamil
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e835b85c1b846003427a1b/1625830840764/book_of_the_dun_cow.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e89c503832431b44086bd4/1625857104219/ologist_medical_meaning.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7f4ae45e16b3be7eaddd4/1625814190430/wotalorasogusiwudexojis.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee69f62af4c01978ff8d2e/1626237430936/canon_1133if_manual.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec78a3dd2ac847ff7d81ed/1626110115962/vizij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a0.bin
240effd270853db8a87092fb16fb1ba1697bf5a1b0bb05eef0b965bcccca65df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 10216 bytes
font_01_sfnt_off0000d849.bin
c554bdf9bae57903b8cce3be6ff261a864301c6cdd60357db7f3f8a630926834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 16008 bytes
font_02_sfnt_off0001012d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes

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