Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b22b5c8b2c01bb9…

MALICIOUS

PDF

68.0 KB Created: 2021-02-12 07:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 63dc615537fd4fe8ed1b53f202fd2efc SHA-1: 96476d321bed357bf6975e1835020ea84f05e5f9 SHA-256: 8b22b5c8b2c01bb94ef83e7a8bdd0e6542683b29572019a42aea4be7ee024718
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a high-severity heuristic firing for a redirector link that leads to a phishing site, identified by the URL https://maypoin.ru/wb?keyword=five%20little%20speckled%20frogs%20song. ClamAV also detected this file as Pdf.Phishing.Trojan. The document body is heavily obfuscated and contains what appears to be embedded metadata rather than user-readable content, suggesting the primary purpose is malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wb?keyword=five%20little%20speckled%20frogs%20song PDF link annotation
    • https://cdn.sqhk.co/pimepojuti/gdr6jaX/idle_car_racing_apk.pdfIn PDF document text
    • http://zazegafila.22web.org/cheltenham_ladies_college_uniform_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/UrhIV6L/28979008678.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/IgFjfoS/how_to_hide_speaker_cables_on_floor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaporam/wapalejabozemetute.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/day_timer_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/zonabevusisep.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/walgreens_boots_alliance_annual_report.pdfIn PDF document text
    • http://muzubosumewuxem.epizy.com/cape_cod_times_traffic_report.pdfIn PDF document text
    • http://xeregolipota.epizy.com/bixelu.pdfIn PDF document text
    • http://xoxejafomi.rf.gd/60326269903.pdfIn PDF document text
    • http://vukilef.rf.gd/guxajigonitemas.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/sosumewopowawiset.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/22141044723.pdfIn PDF document text
    • http://tabojiterakan.rf.gd/zemonotizufugez.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 5192 bytes
SHA-256: 6b67983850ba9a4587e5f14ba1548366b16a5e1d6ca8bb6b3b4fcb69e135d74a
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10516 bytes
SHA-256: 278d250c5039548216c21a5b8d5a463a64df0790ed6c8ff44a45b2576f4eaac4

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