Malicious PDF — malware analysis report

Static analysis result for SHA-256 83afddd3e1da93c0…

MALICIOUS

PDF

158.9 KB Created: 2021-07-12 20:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: da6f8b3a4122cb33a6b17febf1ad77c9 SHA-1: 4d56a9acab675edc16cae256821510c7bc1bd828 SHA-256: 83afddd3e1da93c0bb075afdada28cef84389f0e691fb80ae74c9d46e249384c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded URI that functions as an SEO redirector, likely leading to a phishing page. The document body is heavily obfuscated and unreadable, but the presence of a redirector strongly suggests an attempt to lure the user to a malicious site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5355

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/gOBB6uaVNRA/square?utm_term=environmental+effects+of+rapid+population+growth PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7aab402743737595829e/1626110636032/befopesezazugojibatidefes.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7922950202184f0f6bee/1626110242394/the_golden_arm.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7c62760c9e2bcf424e92/1626111074933/3_hour_progesterone_only_pill.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec79c3947cc46ca1278fe9/1626110403707/geothermal_power_in_iceland_cae_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8f94a83ae0c4902375008/1625880906777/the_mixed_strategy_game_can_be_solved_by.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_off000210bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000228d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228D3 11304 bytes
SHA-256: 279d7ba60dceafe0376ebdeddfed2e655be75a0722c7f4462bfaf53a0c9e45fe
font_02_sfnt_off00024307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24307 17064 bytes
SHA-256: b575b32ab03549dfae4893721438bf6e108b612527210d608c7809e510609bcc

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