Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08bc103d706d700…

MALICIOUS

PDF

75.7 KB Created: 2021-07-14 04:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5dd09bd7f1cb6be309c88072b2a583b5 SHA-1: a12bfa7185b750101080859368300ec4b46d91e6 SHA-256: c08bc103d706d7005235796f04c17a4c8365a8a720fe6bcf3aecb50c7030e586
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, which points to a phishing attempt. The embedded URL, while marked as benign, is part of the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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/W5vEtEh6t-A/square?utm_term=world+history+journey+across+time+the+early+ages+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7d28b6dedd3ae16818a3/1626111272615/68551717623.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e774a8395393225d10b0a5/1625781416254/rogers_textbook_of_pediatric_intensive_care_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80c24dbb92d34f5b09832/1625820196982/verse_about_giving.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8ca221b22c82f862d8140/1625868834691/did_adam_and_eve_have_sex_in_the_garden.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eda0c8b2cb0e52868a2a2b/1626185929093/jetokefopafupezexevoxatum.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec81a254a52c186ce4c6d6/1626112418689/87083882723.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed99dc76150b527e9a9511/1626184156364/weather_coloring_sheets.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0cf7f72ce0266e0be7f3/1626213623406/ebbing_gammon_general_chemistry_11th_edition_free_download.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_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 11240 bytes
SHA-256: a3ec78579698570a7fa078d4749afa4061962dd3add80a2e840e152706399439
font_02_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16440 bytes
SHA-256: 074b65145382419bd23c1f18e5a3cba32e4993590cdc60bb4d4256d3a4798fe3

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