Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59abcd182c3335d…

MALICIOUS

PDF

86.8 KB Created: 2021-07-13 17:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5122cf538912104498837aa4d516fdf3 SHA-1: 1fae60b3ad3b0e75009828c63bf97a2a16b3f724 SHA-256: d59abcd182c3335d008a7e426ee79e6254493c57c500ea441bdfc580cdb09b2f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that acts as an SEO redirector, ultimately leading to a phishing site. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicates a phishing lure for free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/square?utm_term=descriptive+writing+on+my+favourite+book PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca6aa1d0b393375546138/1626121898464/88535028112.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec845fef188817f7e17aaa/1626113119799/somebody_to_hold_its_easy_to_say.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e84b07635b59766542df78/1625836295982/the_art_of_resilience_ross_edgley_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9495c2b60e0ed5b432c6/1626182805140/90157924793.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7eba64aaab0286a8b3d4a/1625811878599/wesanotodafuxepefezodezam.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecbd102746a40efc73b697/1626127632417/9658130694.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8687bcdad2f34d7ec7d8e/1625843835655/hang_me_out_to_dry.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed9f82d2d00a35b8d07eb4/1626185602292/37445531140.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9330f8ce0e10532d343e3/1625895696089/nogoramutuxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed8bf3b1b13d3c3c12ee3d/1626180596129/the_remnant_chronicles_in_order.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9bf35d4dee687f486644/1626184691802/2nd_puc_accountancy_question_papers_with_answers.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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 17068 bytes
SHA-256: 14d3a8e62a639af797dcae905b23a2dcf4c485b330e85e6092587975e6f7ae14
font_01_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 11376 bytes
SHA-256: e5cf7e0db784b4b943eada6672fb49e693115869e3283928f5272db9821ad560

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