Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecb5a1413b2cfcf…

MALICIOUS

PDF

73.8 KB Created: 2021-07-17 19:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7d1f927a3cdc897cc003da0c609e8c6f SHA-1: bc0696a4cf965fe3a7606788cc60c11bfba480b6 SHA-256: 8ecb5a1413b2cfcf0428b7850320d821aab87b5e8e3d299c228fb6f040fe190a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as a malicious PDF by ClamAV and an ML classifier, indicating a phishing attempt. The PDF contains a redirector link that masquerades as a free download, likely leading to further malicious content. No scripts were extracted, but the PDF structure and heuristics suggest an attempt to trick the user into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/4aHNpQc2m6I/square?utm_term=conjuring+3+poster PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0854f91b8e868d28a928c/1626375503425/how_to_answer_why_do_you_think_your_the_best_candidate.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e921a3025aa46e30d2c8c5/1625891235192/carnage_captain_america.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee84adaa539923b58a7523/1626244269501/mechanics_of_materials_8th_edition_solution_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1991489805578dd9a6f20/1626446101042/pcc_and_pdc_reagents.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c67d9ffc3426e8a496a9/1625867901672/43154894775.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_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 14780 bytes
SHA-256: 6c538a988dc8ba998ab90f45a624b936510c7c0ffac6a1902c262af12fd1f45f
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 10652 bytes
SHA-256: 24655ec3d45cc46a8f67acfb7084d12344a7cf1bcd285d8f452b375543d57bb6
font_02_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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