Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65a2a53a8acec5c…

MALICIOUS

PDF

83.3 KB Created: 2021-07-13 04:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: efff0ad80d9f87f39dad2bf72e7b37e5 SHA-1: b74e311e0122d3f32755efbf3e79b295b9129d17 SHA-256: f65a2a53a8acec5c0d1a12b9e1b0c69ad4ae077541846c032ee6b359d9c61ecf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a phishing lure, specifically designed to redirect users to an external URL. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6267

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/mHcMeCcfVl0/square?utm_term=glorified+meaning+in+english PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecd1543b84fb5bce45a207/1626132820931/bunigavanatur.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e81ff107ff2467e631ac/1625876511567/custom_binary_blocked_by_frp_lock_j2_without_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e90bdac22c005c9337cdaf/1625885658176/fepawisufunokiwogobamo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7ee2785664d35b0e83bde/1625812520017/57643588581.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9329e2f3c4128e18ae3c9/1625895582862/wozaza.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e96024c91b61347ea55fd7/1625907236321/periodic_table_images_hd.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 17268 bytes
SHA-256: 3d97de4f063c1e64068b476b6809d6237b34778af7304c0025b09f6e5cabb0ae
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10744 bytes
SHA-256: 8e85be6f49a899c1a7f9e6c674f4bbf95fca92bb23f867b3bf3baae3218c7a1b
font_02_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 18340 bytes
SHA-256: 094ad2cec36fb0270bb6e09b96407c076fd002276db8d899131c2997edc9d12c

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