Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5b0c5e24238fe…

MALICIOUS

PDF

77.3 KB Created: 2021-07-17 16:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f9771b941c9e769a8287a79fe267b59 SHA-1: 1cf86b76724f57e44f78a0d9d5d1956a66232681 SHA-256: b1d5b0c5e24238fe5da6db910598eea9ce2741c4c08b1f8f49f8475ada898cef
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The obfuscated document body and duplicate object structures further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/razvivatel/yapz/~3/UQ8tT55rDuk/square?utm_term=how+to+delete+pages+from+pdf+document+on+mac
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7dfd04454ab0ddd8623b2/1625808848213/kotexedumavedakuwixor.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7b8c9afd06e4982e8c4e6/1625798857871/more_like_wise_mans_grandchild.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f040267fedc2490c0df4e5/1626357798837/tom_and_jerry_the_fast_and_the_furious.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f057a47c351464f9545819/1626363812836/lapojugazujubewelabudu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec895a5f604029b9921144/1626114394631/particular_social_group.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f146d3e75c7a046d9ddc7b/1626425043645/x_axis_is_the_intersection_of_two_planes.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60effc33d777570416538a0f/1626340403478/current_affairs_made_easy.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f23045860d895b481bed37/1626484805824/how_to_straighten_a_palm_tree_after_a_storm.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f26b15699a8678c571a2a4/1626499861742/mopotamakesazulosedazere.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8becef188817f7e23d9a/1626115053114/play_pacxon_online.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_off0000ce38.bin
880ecbb5ad984c4124bea7606c6c46260a88232c2edc44dd2e0b1ceda9643237
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 15908 bytes
font_01_sfnt_off0000f72a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 16792 bytes
font_02_sfnt_off00010f41.bin
0079b10fdfa6f33318120029d047dd9b3d52b95d8f41acae2482c2cbad7db297
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 11048 bytes