Malicious PDF — malware analysis report

Static analysis result for SHA-256 9144c22d49580b10…

MALICIOUS

PDF

81.1 KB Created: 2021-07-12 20:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: df1b857646f74dfaa751aab4d005fcb0 SHA-1: 5b75663f5122b3c9c5e2c70eebcb02563fad5460 SHA-256: 9144c22d49580b104dfd9bd5567444754018b7b458bfdb518e8bfb2936c20f94
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains an embedded URI that functions as an SEO redirector, suggesting a phishing or malware distribution lure. The presence of external URIs and the overall detection pattern point towards a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aauXj3bnHUA/square?utm_term=tinea+versicolor+for+years PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8ff923b7e7c63344eca20/1625882514282/the_meaning_of_dispatch.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8206a7e45264421fb699e/1625825387027/terilulorirovolozetak.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e77dd17920a346d3d194c4/1625783762104/how_to_convert_files_to_jpg_format.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e820a748fdc2594043c66d/1625825447265/jedos.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e79ed45c13cc4fede74aa6/1625792212764/drop_your_guard_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e90cbef107ff2467e82c6d/1625885886495/four_paragraph_essay_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e3c8c14ff043cd597d01/1625875400252/how_to_save_a_webpage_as_in_mobile.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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16728 bytes
SHA-256: 2175bccdd46be49fec9e7abf2b78a04c88fb5d6e2e335c49147f95f25931afda
font_02_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 10372 bytes
SHA-256: 250fff4115e8e809a7cb1d0ffd58a416745496eafa7300e1d1afccdf0367a051

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