Malicious PDF — malware analysis report

Static analysis result for SHA-256 32dfc59fa8544e31…

MALICIOUS

PDF

66.9 KB Created: 2020-12-26 22:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5a4d396f7a5c64997acba7b3631081e5 SHA-1: ef1f317be46730d881c63b7629263f2c8d142955 SHA-256: 32dfc59fa8544e31a51a6e444b5e052e9663ff4a819f00c3d4c9959b82f1c3b8
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a suspicious URL. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to redirect the user to a phishing or malware distribution site, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=voice+of+alexandria+contests In PDF document text
    • https://cdn.sqhk.co/kujusiru/Difjbhc/high_school_basketball_2000_point_scorers.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/CBhfsff/new_ktm_1290_super_adventure_t_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/5riihfT/free_classical_piano_radio_stations.pdfIn PDF document text
    • https://cdn.sqhk.co/jibetovo/TpQtjeH/piano_chords_songs_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/jcibbje/boxing_star_best_build_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fb4341f8313e.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/Fiidtna/sapelojelurijif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/badf45f5-0ce8-4260-8f89-a90a47ce2b00/mit_neuroscience_phd_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda2f3c2-d3ba-4b7d-9fe1-b67a286526c3/jakoziwoxoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13b9a04-df8e-4efb-8560-75b0e2a7d51c/gaspard_de_la_nuit_stallion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa7bd23-39ed-4bc6-b956-37e2835cd195/79625888651.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://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 4836 bytes
SHA-256: 9f0d2240848da53d84f62cddcb5bf1f927ad9e9b812680a46f929c2983e0d8ce
font_01_sfnt_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 9880 bytes
SHA-256: 409d38092f1703dc36f17522760a9492939229d214ca9c3d087c8d0b18182416
font_02_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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