Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde4f1e807881819…

MALICIOUS

PDF

152.3 KB Created: 2021-07-21 22:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5616f899815e00638515af592615c653 SHA-1: 0070237048e9092ecd25b537b633b5e500b8314b SHA-256: fde4f1e8078818196ece2a371e2f1dd13d69f262b008ca8bdfb9a09a87cbcc09
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI that functions as an SEO redirector, identified as a lure for free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/k6oGaauGqGM/square?utm_term=water+hyacinth+and+water+lily PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee32c5aa539923b585a5c6/1626223301413/care_bears_and_cousins_characters.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0c6055142327a873c4c9c/1626392069560/he_that_believeth_and_is_baptized_shall_be_saved.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec93083080d76c7a5201cc/1626116873104/5146240220.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e87006131e486bf96237f5/1625845766292/30034678888.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0edd5c699444e2e3f0397/1626402261425/54823255910.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f46b756c177f33d7ada2d8/1626631029957/download_game_most_wanted_black_edition_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecd2553b84fb5bce45b6b9/1626133077832/bikukevinirefodebolab.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f34a9b4f27972c60406ab5/1626557083989/maxatusemaxunobuputa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7d6931b0b43e07e629cf/1626111337729/nubalukamasanudekuxesob.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f308bbc2d40e67ec0705e4/1626540219321/kexivi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f09ff69f99b45218f2caac/1626382326668/surface_area_of_pyramids_and_cones_maze_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f05fbee74ffe73c203c750/1626365886897/flute_and_oboe.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f243caec23251fe3c2bb0f/1626489802693/agile_transition_plan_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e87cdb33c3d3411a98e782/1625849052066/xasidon.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f04deeedb3c849506fb98c/1626361326787/nutonu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3bd81699a8678c57fd053/1626586497173/kowevatekotekoxasufi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed86321c817c33f6d7ec70/1626179122834/gay_male_love_quotes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e77f53e1db80072fa5fddc/1625784147147/fumagixijirirepagaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f15d81347a2e2c8401b5b8/1626430849530/something_i_never_told_you_full_book_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1ce398c193a60fdf48fa3/1626459705520/forklift_owners_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0e8567ffd90482e340eb1/1626400854735/pain_in_the_elbow_nerve.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_off0001cef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEF2 18748 bytes
SHA-256: 3608dc64486b895472a610ca409abb212cd05f8289e59670f6b1852bbb18a3a6
font_01_sfnt_off0002005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2005C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21873 10372 bytes
SHA-256: 73fb55e01ae75da0c33807ffc72c76c8451e1abf2753010b1d6d4d372dc1138e
font_03_sfnt_off00022fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FD9 10260 bytes
SHA-256: bbda08f2725620012419b1ba5b701d36569766fed512bc7f2cd86f8bd68bbdfb

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