Malicious PDF — malware analysis report

Static analysis result for SHA-256 90232ec3b9cc0dd6…

MALICIOUS

PDF

90.2 KB Created: 2021-07-13 21:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1264ffd9a744625b839a1393c42607fb SHA-1: c3e1a029fd9f4a1bba056c24f46d8e8072c5a678 SHA-256: 90232ec3b9cc0dd64c6cfa2e417bbdbb2d34605e11fa3f603bbf9c42aa981f0d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic indicating it's a phishing lure using an image to redirect users to a suspicious URL. The ML classifier and ClamAV also flagged this file as malicious. The embedded URL, https://medvor.ru/square?utm_term=cloning+hard+disk+to+ssd, is the primary indicator of compromise, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/square?utm_term=cloning+hard+disk+to+ssd PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e93618b132fa3620743103/1625896472366/94282365532.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eda081b2cb0e52868a206c/1626185857943/video_maker_apk_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8ff833f195e1e4034f644/1625882499826/93087343558.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d4b300b83d0a108879f0/1625871540035/cars_with_manual_and_automatic.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8f299c874e714248938d/1626115881527/food_delivery_near_ne.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edb42c5a30a704d0c23a9f/1626190892741/fokodezewigirunagi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e86e02c2c24e72b2b5ca8e/1625845250839/27458386598.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec98e880388a1034d8fd44/1626118376200/what_grade_do_you_start_middle_school.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e835ab7d3b385c94b92826/1625830827655/task_based_learning_approach.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edbaa9629ffd0e3632a927/1626192553573/ralebedarobum.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7c6c197884458c9a0c354/1625802433170/76128334745.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c0f9fe2317389ced5611/1625866489985/answers_to_the_game_restaurant.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e51812fb7d0b279035f2/1625875736204/general_trinomial_examples.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda5e0c48108232e45c026/1626187232420/how_to_get_blood_out_of_cushion.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79fc0dbb92d34f5ab734c/1625792448350/rogexireviw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 10516 bytes
SHA-256: 2c63b697876a56d51ca5ef0d3ac4f65548c595c38dcc5a4a95877da108079d37
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 17324 bytes
SHA-256: 256088a8d46c72a52c4bb0e0536639e7e575df9090ce5c3032bf959fe68bc979
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 17192 bytes
SHA-256: ed29f9d24967b16624c34cf92c11a4037b114c21ccbe84dcd6d80715dd311ef8

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