Malicious PDF — malware analysis report

Static analysis result for SHA-256 afad6a0713958500…

MALICIOUS

PDF

117.0 KB Created: 2021-07-16 18:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1e4b4f33c79700e905bf3e5aec675a48 SHA-1: c156c6468c0847f2d1b44886aa4c622ee8f9b1e1 SHA-256: afad6a0713958500f32235cf60edc989adec6da6b2a38ac94d5581b804646494
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified an external URI and a redirector link, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of embedded URLs and the overall detection suggest it's a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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/eaN1Eb74jJI/square?utm_term=steam+turbine+in+nuclear+power+plant PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f23937da2614570be841/1625879097551/61315002243.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecac8997282d6f46943739/1626123401499/37_relapse_warning_signs.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93e7cb68d8f0f4bf938a6/1625898620726/your_dns_server_might_be_unavailable_windows_10_fix.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7fc5a4d2175279d14af9a/1625816155114/xoxidovojoro.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edc2ed6f11847873593e85/1626194669745/mebupulirasabowuzimawago.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e818057d3b385c94b7e633/1625823238065/befufajawifafolenula.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

Related samples 8

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_off00016998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000181af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181AF 10768 bytes
SHA-256: c765dd06a28cb6a3e4f05c5d8ddad994eb8031048e77acc54fa725ad17f3860d
font_02_sfnt_off00019a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A42 17476 bytes
SHA-256: 49e54b3db0b14f2649cb93c23c01f3003e0a8214378674bb95f0a5caf440b55c

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