Malicious PDF — malware analysis report

Static analysis result for SHA-256 02673ed6d9b96c27…

MALICIOUS

PDF

79.1 KB Created: 2021-07-16 05:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d4c66070b9113848497b58a7c67ed2eb SHA-1: e72002599e224b0be6a80a4482e38c56ab9d38fb SHA-256: 02673ed6d9b96c27f94a4a69e4faad8c8d9bcf2d6381b1321a4e484fb79cd4fe
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including PDF_SEO_UTM_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, indicating a phishing lure. The embedded URL points to a redirector, suggesting an attempt to lead the user to a malicious site for further exploitation. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=question+tag+these+those PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0e34da57b467a228cf99c/1626399565684/rofolesezelevesimimodus.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e949943ba7d954d54759dc/1625901460278/vexadeferubivaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0716df3478d215cea9e47/1626370413202/39110244095.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7cf314261ba7980609f0f/1625804593884/vosili.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0ad26d33318057715970a/1626385702448/42005307749.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7e3a72e2584f2462b48a/1626111546808/bewageravilomuvov.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8154ca3609a707bae73ac/1625822540404/54390118648.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e78d3c1c6ee137fa0c2786/1625787708623/3011740775.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0beeb5422dc4ac5bfeddc/1626390251910/55982136776.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f090c9bbc67365750b1aec/1626378441814/bullies_how_the_lefts_culture_of_fear.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e952c819a9f87deb746668/1625903816620/pulp_and_paper_chemistry.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_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 15680 bytes
SHA-256: 97e299ec76b8ae760d1fc78ed9a8ae45f2f2a3fc9ff77b1214e8a6871bd38ab5
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 10400 bytes
SHA-256: a3e8b9f1458e929d1f867f0410cc20a82636a0214712d1db932813878eb9dda0

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