Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f349f09a7b84daa…

MALICIOUS

PDF

149.1 KB Created: 2021-07-16 00:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8aecede4e62a5ba87cb056dd21707e71 SHA-1: 0dd90b12c33c3df9e51af39e978ab477686dc300 SHA-256: 0f349f09a7b84daad4b2352f351f927b66d60f4da4d70ce469e438a040ec6432
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, using an image to redirect users to a URL. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing attack aiming to trick users into downloading malicious content or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9503

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/~3/7R6buoffwiA/square?utm_term=rename+local+branch+in+git PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0c6b2af4c01978f910e9/1626213483573/durden_and_hunt_chigwell.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f008d534f25751eec28faa/1626343637663/koxogotisanob.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8baf7e5cd11affce190d/1626114991884/latter_meaning_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0300898ba4d746119dc33/1626353672245/rewamipapibet.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec79524c0b954f9ea33ab4/1626110290099/french_in_action_audio_files.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee47717426fb5109f55636/1626228593460/vokek.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec78465978cb5ccaa9a5b7/1626110022470/stout_hearted_definition.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed9b23cd5f69124b40e8a6/1626184483186/big_bend_national_park_itinerary.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f06673e8848a1fc2438515/1626367603787/different_ways_to_propose.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_off0001e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6EC 19864 bytes
SHA-256: 86cc480f428c02c332634f04a21aa04095f140257ce6b615754f60a0e2148ba2
font_01_sfnt_off000217bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FD2 10696 bytes
SHA-256: fce59675723843b19cfd04337c14c272d406eee373c978b96e47f9c2267a0b03

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