Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27dd27b90bc07c4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-16 09:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c893d2becb525603ea6126b9e80cbb4 SHA-1: 916e72b9bac61f3b754d4339ef2fda785f65f539 SHA-256: c27dd27b90bc07c42d82595f7ad79dad9826116b059fe7767e073a0176759f63
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including ML and ClamAV detections, indicating it is likely a phishing or trojan delivery mechanism. The presence of an external URI and an SEO redirector link suggests a lure to download further content. Although no scripts were explicitly extracted, the ML classifier's high confidence and the nature of the heuristics point towards a malicious intent, possibly involving embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/razvivatel/yapz/~3/um1bUVUAM38/square?utm_term=english+for+elementary+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f11e16f75f957e35b6c43b/1626414614491/rs3_mining_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee8ea42d09e34b72a4367d/1626246820445/15757502748.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9374fe370ac63228997c9/1625896783804/55307190477.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8889c217102653d6b475/1626114185835/pdflatex_for_windows.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0f1002c92ee1ddddb4a2c/1626403072431/xojodutedozilawedisuwez.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0ab615b7a40450a501323/1626385249599/retroverted_uterus_early_pregnancy_symptoms.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a5c472e37e45a32313dc/1626383812442/7800222687.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0fbcc96ce9b33d72e9445/1626405836531/geniwoxupedijazujekupedem.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0cacbd1d8e65aae816ec9/1626393291874/vupawalovo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92a71951226b8b8c0440/1626116775219/zuvewexuxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f032a0c00d13116b46b940/1626354336695/zipajiduka.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 2

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_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 16712 bytes
SHA-256: 98a408377f73fa8fcfc193f859cffee8ef5f871c0e6b33fe844d3c886dc266b8
font_01_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 11040 bytes
SHA-256: 9a1961a2fe6418d0d783df6fcaf9893ccd41871366e60518bfbb269aabac9529

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