Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12eed00cdae5f40…

MALICIOUS

PDF

77.8 KB Created: 2021-07-19 20:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d03adff54c82b85a2a94889cc35caa38 SHA-1: 181236c1a0f9c3328221e59e95900ad7eff7ca20 SHA-256: c12eed00cdae5f40a6cdbe6a8eccb36ca1d50e157ac0c76a709d16a5977c50c0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The presence of an external URI and a specific heuristic for SEO redirector links indicates a phishing attempt disguised as a free download. No scripts were extracted, but the overall pattern suggests a malicious document designed to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/ZV5PD9BTPXI/square?utm_term=grated+apple+baby+led+weaning PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f52868cba7b71501fc0556/1626679400094/13401180379.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f25ee370ac632286f614/1625879134660/partitions_piano.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f2f812b84a576e6cfb7fed/1626535954761/warhammer_painting_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec81747a1add4dee1f5325/1626112373150/dugilobori.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee24131f51426150cb5265/1626219539201/the_devils_punchbowl_san_diego.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f04efb6e271825e940a261/1626361596017/assignment_of_mortgage_example.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1703bdb86a67d8585656e/1626435644208/40482468772.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3fa866c177f33d7a8dfe0/1626602118662/bipawivabose.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8419ce41cee5c0c77b731/1625833884192/pdf_file_converted_to_a_word_file.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee12defb3cc800db523fca/1626215134290/xalidagomulizikaxakij.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_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 10660 bytes
SHA-256: d9ad910ffa6f8ddb398686ec0bfe5d4f1c3fafa9030bec9f7fde2029064c02cf
font_01_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16992 bytes
SHA-256: 8cdc484a00f7828622060b607a9e48063b80bd2ec8b79705b75f33b3684e4d44

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