Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c75d3be1e756dc…

MALICIOUS

PDF

75.7 KB Created: 2021-07-17 19:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3dd61fcea69a4ed19b24c34945d2e71c SHA-1: a16183540b138fe1af65d2cdf1a2f61fd8875995 SHA-256: 88c75d3be1e756dc65f8bc8ab074f77d2c3f4e2f3fa21fa9f06b19b3f922f45f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified an external URI and an SEO redirector link, suggesting a phishing lure. The embedded URL points to a redirector that likely leads to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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/sq/ugae/~3/eoPDrVzwpx0/square?utm_term=star+wars+monopoly+game+rules PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f25f4b26e2e727c2575cb6/1626496843290/nitososur.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e924f3854c1d3b34871733/1625892083179/morrison_and_boyd_organic_chemistry_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f215f46167905317cd88eb/1626478068348/56515772157.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edfb3677fc8e778b5a7050/1626209078822/86544821032.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e77ff21f34c21d1885fe2c/1625784306126/suvawesufes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede8d1c450ee47308043e0/1626204369964/lesutenujanofikazogo.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_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 10876 bytes
SHA-256: a479ecd1dfb0b30136314566986bad11975dbc28dbf457f1a4645fef7fe4c51e
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 15900 bytes
SHA-256: 748d85f86468e388a63ac2d248083e792c8c73556f7cd37b67a73f4a17e758c1

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