Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5a22b50adcffbc…

MALICIOUS

PDF

73.1 KB Created: 2020-12-24 19:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 14911c1892fef187eb00b4a6eb6af136 SHA-1: b5c61d6888b093c53bf46e39e054cdd169445547 SHA-256: ff5a22b50adcffbc84314d1797aac889d8425a73d889d7064d6cf54ad0204cc5
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an SEO redirector for phishing. The embedded URL, https://traffnew.ru/aws?utm_term=florida+collections+10th+grade+textbook+answers, is likely the primary malicious payload delivery mechanism. No scripts were extracted, but the overall pattern suggests a phishing lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=florida+collections+10th+grade+textbook+answers PDF link annotation
    • https://cdn.sqhk.co/letowajaf/PuaigFP/taxetodaxupuvaxeduzut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5fe0fb5d96645.pdfIn PDF document text
    • https://cdn.sqhk.co/dijobika/Migdmja/linearx_leap_5_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23e16f3-db44-4fc8-9390-7f72b53eecde/xoguli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996915e7-0e76-411a-8994-cbf0a719f0d0/87388067398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c94f4c-9ece-4255-8c50-edee38295ad8/super_smash_flash_2_mods_dbz_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f372d906-b07d-4409-8b61-bae54ffc54ad/12145068613.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/echos_headphones_quick_start_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383d71e0-c6e2-4639-b65c-3c7379cbf5d5/78281901352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9c7b62-bcc3-4cff-9e75-7b67f7431c27/disney_descendants_2_soundtrack_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5180add8-5188-4bc4-a6c5-e6cdff4268c8/calendario_185_dias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c837548-9db2-4072-9344-f2d4099a8856/nonur.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/unix_and_linux_system_administration_handbook_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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5716 bytes
SHA-256: 8380d18c0dd5d444669d3ab97bff109a2b2c21161e7fc830aeb7d73de6543871
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 10064 bytes
SHA-256: 65d38d1ab8597623f2f39fcd2fc07ee3c83ba88ead4c500387e2b2e2a5539b27