Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03fdb2adb4a146c…

MALICIOUS

PDF

75.0 KB Created: 2021-07-12 20:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7347d94bb8c840b6736d984e94ee0219 SHA-1: 7ab7caa41550d0c80ca9c391c8cd061987347651 SHA-256: b03fdb2adb4a146c7b60ca33eacfc24d3c658d98094d7591b5ff784ffe53ca7e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains an image lure linking to an SEO redirector. The embedded URL, https://huntic.ru/square?utm_term=forces+on+a+free+body+diagram, is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern suggests a phishing attempt via a malicious PDF attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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://huntic.ru/square?utm_term=forces+on+a+free+body+diagram PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e78ed686d8930991a1d5f0/1625788118690/use_protective_clothing_and_equipment.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec79203f7a034ccb796281/1626110240344/zatuludejivo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec78d082b4c978cf407d8b/1626110160191/industrial_electronics_lecture_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e95c5819a9f87deb74991a/1625906265028/lijewa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e803ae6e46386ca3c23c7b/1625818030680/mowoxox.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7c66b4454ab0ddd850151/1625802348133/graph_the_function_in_one_cartesian_plane.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_off0000c280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC280 17284 bytes
SHA-256: 52d4487daac9cf819ce5ef22e53374e26c1fb68e0742fc366de6625b8057d478
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10904 bytes
SHA-256: 6198c9d1aba1a2aec9aa88b84c2a8f17a99b36cec1b162094757fb43eaed96dd
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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