Malicious PDF — malware analysis report

Static analysis result for SHA-256 b290c20bf2b4e687…

MALICIOUS

PDF

97.7 KB Created: 2021-07-21 15:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: eb07b6c84db0501a329ca1a13d0b0413 SHA-1: 22eb578d1f470763ed1db5d5f907bd5664846418 SHA-256: b290c20bf2b4e68781eb72b3e11a88a1bb45fc32643f3a25fe219ba413ed5537
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of an image lure linking to an SEO redirector, suggesting a phishing attempt for free downloads. Although no scripts were extracted, the overall structure and detection signatures point towards a phishing campaign leveraging a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/eaN1Eb74jJI/square?utm_term=i+need+this+song PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4eea80b17490892211cbc/1626664616701/46388466637.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f00f4c1c2a3138378effe6/1626345293090/windows_cannot_install_on_drive.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecaa881996685841ac6c5d/1626122888851/wegawapovadowowog.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4380025edf1230662ce81/1626617856195/gilafubifuzijaveropamawa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f1711d425b7b741788bef1/1626435869805/how_to_remove_digital_signature_from_computer.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e924f4e6bd1231e6080f11/1625892084470/11838804985.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f77cc586bb0f671476bc01/1626832070037/english_proverbs_with_telugu_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f422afe13ee976660f6d1d/1626612399780/lumolinimanusizibal.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee63ec77e2cd4113f2647d/1626235884662/niwinikopowonumarituf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f07afb98e33d2cebbf03b1/1626372859319/6384911827.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3b5b736db646251a45acb/1626584503725/who_wrote_the_song_tom_dooley.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f2b1bdd9389f5e80865b8e/1626517949287/clubbed_to_death_piano_partition.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3b58b730b252c881a5c34/1626584459963/the_most_effective_natural_cures_on_earth.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f2d8a3ebca9b5ae8e5f72d/1626527907883/death_note_relight_visions_of_a_god_full_movie_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f7a661c92ef868b9229574/1626842722065/xugugebevexumaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee6505ab0cb8743be71c4f/1626236165611/tuzikuxosupuzese.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95bf96e267257943c9414/1625906169343/75369098684.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee4fbe1f51426150ce4331/1626230718210/comments_for_students_homework.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_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 17124 bytes
SHA-256: 3e46f72c8d35739ee86bad101f1766053e2cd2cbc03ab5db171c7013e5b0a4ed
font_01_sfnt_off00014b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001631c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1631C 10172 bytes
SHA-256: 37aade5caa7f6b55a05dfbea439784c8b4600ca67e424ee0167addb9f6e3e273

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