Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1885f8cf309488a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-17 09:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 196cb713ff3db7f20426c7073c850089 SHA-1: 375524924b6036baeffbb9563e1f1f7401b821e4 SHA-256: a1885f8cf309488a2ab2e1243f29a42d0feef9569c0f01d00620b73582acb3b1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a Google feedproxy URL, which in turn redirects to a PDF file hosted on squarespace.com. While the direct URL appears benign, the overall structure and heuristic firings suggest a phishing attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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/razvivatel/yapz/~3/NsX9ihectO0/square?utm_term=a+little+book+of+life+pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e910ebc91b61347ea30aae/1625886955343/popikoramalila.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e846fc2f85bf4fcbe800de/1625835260945/vukikatawovolelamas.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0764da3cf1b7cd43658f6/1626371662030/a_level_physics_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e768e6bd1231e604ea11/1625876328117/4_letter_words_with_world.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0dee1cf0e6777f2ac3c2/1626213870249/1579616253.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ed5fdefa333328a80d1f/1625877855255/indian_movie_mp3_song_download.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1f2ab6cc3a66bf95d342d/1626469035143/notice_of_reassessment_meaning.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0052a0dea5e4896bd50a3/1626342698214/parks_and_recreation_website.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f2664c503a216717880c99/1626498636603/26595891670.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_off0000fc19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16792 bytes
font_01_sfnt_off00011430.bin
536a434059cd070b8f677727d8ba2fa97aae04522db1c029066b53900aa89365
pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 10168 bytes
font_02_sfnt_off00012ac9.bin
3477b18263e315f85517e51b04310ed8219416cb825d7c5dacd4284569b4251f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 17380 bytes