Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a46b5ec9518d12…

MALICIOUS

PDF

77.4 KB Created: 2021-07-18 10:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 53ef879d5abb5f7c7d1a7df860d404e5 SHA-1: ed9fe051cc334fb5e1e30b691b4cb4499356ccf3 SHA-256: f5a46b5ec9518d127715da4890f61cf05add51017afd349c4030ac4cffc9866a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to an external URL. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of a redirector URL suggests an attempt to lead the user to a malicious site for credential theft or other phishing-related activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=today+gold+and+silver+rate PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee37b202e0767984f31696/1626224563066/fuzobidodewasuxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edd137c450ee47307d6bfb/1626198328071/indirect_coombs_test_tube.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0970f06b4922924b562a1/1626380047743/mechanics_of_wave_forces_on_offshore_structures.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a0a808c731162ada6ed0/1626382504930/jumijurav.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3aba2699a8678c57f22ac/1626581922222/49563993464.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3a2a126e2e727c265931a/1626579618079/kodobofalezelibedo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8e3222210ba6bce0ec897/1625875234416/pokemon_sword_and_shield_how_to_evolve_eevee_into_sylveon.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7c4446e46386ca3bf62c9/1625801796122/70_mile_to_km.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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 10568 bytes
SHA-256: 42868228e884f14edcf54602f946bdbe7cbdd52c01f80b6cf0f8c9f34debc8ea
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16384 bytes
SHA-256: b624e44cb8fb71a542739e7bb9743e3adea1491e1b219b433ff394d0301b7f7b

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