Malicious PDF — malware analysis report

Static analysis result for SHA-256 db37379544e076ec…

MALICIOUS

PDF

76.1 KB Created: 2021-07-14 07:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f812644f913300363d1959c2b3978aa5 SHA-1: ae75f1531434f8a6b279b375db903322014373d1 SHA-256: db37379544e076ec502ac1d4b602b9fd7adf603fbbb3a0174f9a1dfff7894e44
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it's a phishing lure using an image to redirect users to an external URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL suggest a phishing attack designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/~3/4Ji06Fp1PxY/square?utm_term=township+hack+2021 PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e2c7085b1c120f9461b5/1625875143797/wibirazakosodobajamoju.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e940ac0a287971af9ae76d/1625899180582/nowudazopeni.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93eafdc37083541b9b6ee/1625898671944/75179981708.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e85607185bee37fa80e849/1625839111821/158275198.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee65addf274736e0ae2162/1626236333805/ronowozusegufatikenogix.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede7986d720f75fb619703/1626204056670/61745428488.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0aac8feeeb055d95f900/1626213036194/meaning_of_normalized_data.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee4b4c02e0767984f466b4/1626229581153/97695576462.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edd1eee635d716646069db/1626198510202/69589531840.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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 16772 bytes
SHA-256: afa03e86816665ad32df8afaf76d14949109252cfa8e370f470d87c44129cef7
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 10532 bytes
SHA-256: bc7716dc22a0461317110e6e603cacad254307d8b370971d7ddf4e2924fa6d71

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