Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2eb0e5878d97abc…

MALICIOUS

PDF

76.6 KB Created: 2021-07-13 21:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 428c5a343adee06208a99b9578eb260b SHA-1: 11c7b826bdc5fd3432d3df7fe326dfd7ebdbad20 SHA-256: c2eb0e5878d97abc284c02ef9e2a70eaaff64120b6829461ef851a712dcfd1cc
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. Heuristics identified an external URI and an image lure linking to an SEO redirector, suggesting a phishing attempt. The embedded URLs, while marked as benign, were part of the lure mechanism. No scripts were extracted, but the overall structure and heuristic firings point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/XMoLd4EPXkg/square?utm_term=elephant+and+piggie+should+i+share+my+ice+cream PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ca349ffc3426e8a4ca5d/1625868852611/area_bounded_by_graphs_calculator.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9252a8915684aa53d7025/1625892138296/fortnite_account_with_all_skins_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e87fb11f43651348e14ace/1625849777818/getelagezulanaropoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edc0ece55429721e1de17b/1626194156892/59766444081.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_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 16116 bytes
SHA-256: b6e37afd59b38d1d985c598704ee12add0a9c9148d1ce483813881909934551c
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 11160 bytes
SHA-256: 45c2fcb192640ea3516b9c8906304bf3354ba3f6f32a7ac77b03e6bd11afcf7c

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