Malicious PDF — malware analysis report

Static analysis result for SHA-256 7288650ce575c237…

MALICIOUS

PDF

78.6 KB Created: 2021-07-16 08:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa540cbd9cb4f6d2439a81436cedb57f SHA-1: a075c4344ec6e88a14742c4cc9ff80f3b53c487f SHA-256: 7288650ce575c2374919dcd98aac2dc4a79fe51f26d13322263b579dc82edec2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to direct the user to external resources. The document's structure and heuristics point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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/~3/4aHNpQc2m6I/square?utm_term=little+house+on+the+prairie+museum
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec849eff9c8b53cea29040/1626113182261/how_to_sign_the_word_language_in_asl.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee3a10fd66ff3739ee4157/1626225168874/wavagagaporo.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f08e05bd29583b673cadbc/1626377734084/overseeding_after_aeration.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e887e12bb6eb6bb437eacb/1625851874006/99509839093.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8fac28fb24157da6e83fa/1625881282546/sarirujolexejizomob.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8bb1bd7d143313afdbcdc/1625864988034/top_interview_questions__answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8fa82dc37083541b70ed7/1625881218294/my_hands_and_feet_itch.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0be94d1d8e65aae80c537/1626390164464/our_lady_of_the_nile.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e266b9b95949b65b5dc5/1625875046656/victure_wifi_extender_manual.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_off0000d1bb.bin
90f4d9a91d0d9cfd4a06e64f72529d705bd458745e0632e6c9f8cbaa3d671d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 17016 bytes
font_01_sfnt_off0000fe18.bin
c191519c15902a2db3191ddd098cce8e0468df58f0239098506d580327476853		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10576 bytes
font_02_sfnt_off00011605.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 16792 bytes

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