Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cf6b0f7ee6b8a3…

MALICIOUS

PDF

75.0 KB Created: 2021-07-14 01:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a7d73ce0970162414b6a25b8a6858593 SHA-1: eb222cb22a2bbdd71f785566ead9ae29d27cab89 SHA-256: e7cf6b0f7ee6b8a318280c7932d4435129c142fde1a1003c4a7ea97a9266d6f7
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. It contains an embedded URI that redirects to a suspicious domain, likely intended to lure users into a phishing scheme. No scripts were extracted, but the overall structure and embedded URI strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crysiq.ru/square?utm_term=which+function+shows+a+graph+that+is+always+a+horizontal+line PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95870e6a58043b6933b82/1625905264672/23715555939.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edf9767979814f85ab1ddb/1626208631091/how_to_start_out_in_subnautica.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee112fe7148d06bc6d44c2/1626214703455/wow_bfa_jewelcrafting_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0083d6ef6771c1df9534/1626210436119/77763951905.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e799cde8ef4d41b4f6f92f/1625790925218/liminu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eceddb3489b768f16a4b5a/1626140123385/critical_strike_portable_online.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9096df492d21a0f69f167/1625885037279/out_of_county_warrant.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecf1d702ab3a569c3df6d5/1626141143323/ionic_or_covalent_compounds.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94870b132fa362074c32e/1625901168193/how_to_compute_binomial_probability_in_excel.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_off0000c09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09A 16344 bytes
SHA-256: 1546a7e2e313f5dffae3edcfd3e0bb0210959844c4521326afaadfa94ace7912
font_01_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 11112 bytes
SHA-256: f2dd36fc0ea678a73857be239117d8cfd4e457e60d9c625ab987cc52005b15e3

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