Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd9b2280ba199f1…

MALICIOUS

PDF

119.4 KB Created: 2021-07-14 00:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f844c7877d991461c0222c41fd039465 SHA-1: 372ea902bbe936f6dd07ae341b21a83893f90a0f SHA-256: abd9b2280ba199f168ddfffa9a3eb90f63a69f50e8be9ad3693f91fb561808a6
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 external URI to redirect the user. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to lead the user to a malicious site, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7499

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/ZFaGRQ6RLlg/square?utm_term=level+of+thinking+quotes PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed2ccfc439f82871623136/1626156239694/18845261131.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edff9fe7c05a53525a7893/1626210207130/73878807723.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e868370da4b337b3e4423f/1625843767468/setavikogisimi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9622b025aa46e30d4c70d/1625907755328/bizarasu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e962565ebba154a8fe521d/1625907798274/jasevagatiragagukipi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee0045e55429721e24d3fa/1626210373321/wokamawedirusedurudewe.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec83afbdd82073f6ff1270/1626112943107/89216055529.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_off00017224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17224 18228 bytes
SHA-256: 95833c2b9c97f437d474cbe9a5a0bf8ac3741e5483aa529358d8ea0363111d1f
font_01_sfnt_off0001a20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA24 10592 bytes
SHA-256: dbbbea7c34f12b2c19e926d23733dbd6f77fff4e09d3fc7f79bddcf8511a70bb

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