Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7c1a7ed1ecf7f4…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 13:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfb37d52f8c5261107df2a22c4d7e287 SHA-1: 198b4402383c0d309e4ffbe24fad1d65478a08b1 SHA-256: 1c7c1a7ed1ecf7f471007a81d6e48af5f51e52601ce4d5e9f3383fca8047c65f
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, specifically as a phishing trojan. It contains an embedded URL that, while currently classified as benign, is presented in a context that suggests a lure for downloading content. The presence of PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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/-MXWpcYQ7kA/square?utm_term=download+gta+san+andreas+for+windows+7+highly+compressed
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edba69723c4d01406f4d48/1626192489787/sopan.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed3a3aff6d86145b9dfee8/1626159674826/kolozofelefet.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1366ce013e242e714baf4/1626420844407/divide_into_two_documents.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e95a8f6e267257943c89c4/1625905807366/mortgage_by_conditional_sale.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4b7b60b174908921dc1b5/1626650550625/another_word_for_advice.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8a97a51c23d46c46584c4/1625860474227/64100792494.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7c4041c6ee137fa0fa785/1625801733136/one_word_question_answer_on_child_labour.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8863eaa19e084bc1d081/1626179683444/the_story_of_my_marriage_by_chetan_bhagat.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8fcd212fb7d0b2791e055/1625881810865/home_treatment_for_hypoxia.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee858764675e3b9de53af1/1626244487359/rats_have_rabies.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e581c0906550d9081ac6/1625875841797/loss_of_smell_homeopathic_medicine.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7c5049ebc0053f3157128/1625801988492/39066033185.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_off0000e843.bin
5130064c25c964f5a82a229e9b4cab89e938d91ee4026b445a10ca52a7744914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 11320 bytes
font_01_sfnt_off0001029c.bin
110da615ac252a990daca29da986ad96cb95fc8657aec54127c0f42714b93d5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 16100 bytes
font_02_sfnt_off00012c50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16792 bytes

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