Malicious PDF — malware analysis report

Static analysis result for SHA-256 964e1838a480b237…

MALICIOUS

PDF

111.9 KB Created: 2021-07-17 22:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 79efdf01a0a2fe8df1c9e6677ef099d6 SHA-1: c38a186f4d90e22d7a83e913e4079e7baeacd62c SHA-256: 964e1838a480b23789a49bbe3625b4e00d978bc454230577668ce4c5af7ec5f4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a high-severity heuristic identified it as an image lure linking to an SEO redirector for free-download phishing. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to malicious content. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6270

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/~3/4aHNpQc2m6I/square?utm_term=precalculus+with+trigonometry+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e818a07e45264421fb1af1/1625823392534/micronutrients_for_diabetes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee7ca77dee9f188f7c02f5/1626242215430/covetousness_meaning_in_the_bible.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8d5cf78606b4d18574e90/1625871823743/remo_recover_keygen.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_off00014fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD2 10976 bytes
SHA-256: 5b5c4a4f50ddf1cd459392f7003475443d661a6a1afe505ecf1f358af85cd6c6
font_01_sfnt_off00016938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16938 18320 bytes
SHA-256: feb25dfee98b597a71f92e5485b30d84f874e930d61c65a5bfb3bd6cee9dd863
font_02_sfnt_off000199f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1