Malicious PDF — malware analysis report

Static analysis result for SHA-256 675e383fa0a78dd3…

MALICIOUS

PDF

73.3 KB Created: 2021-04-01 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 837d6af461e3b55a35c8bcbea1584311 SHA-1: 6cb5de957ae0ad02a3a778dc9221b9349a3e8fd3 SHA-256: 675e383fa0a78dd30c31c78b51d092365bb0babd5c0fc8d49daf506ed41e45cc
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-confidence heuristic indicating it is a phishing lure, directing users to an external URL. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a malicious site, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=academy+stars+4+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484820/normal_6011523d18a36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445337/normal_5ff5680d52255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5fed6634accde.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/mcgraw_hill_my_math_grade_4_volume_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5ff2499087d2a.pdfIn PDF document text
    • https://nogulakotu.weebly.com/uploads/1/3/0/9/130969216/5017054.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/storyboard_sample.pdfIn PDF document text
    • https://kibajalixil.weebly.com/uploads/1/3/0/7/130739780/897070.pdfIn PDF document text
    • https://xudorelaguf.weebly.com/uploads/1/3/0/8/130813521/a0c529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5fd7d72be9650.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/adeste_fideles_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_6000e6ba4d4c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_606014b8799d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_f595badf251e4bcd98acebbe0b87b6e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/748500692.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/direct_and_indirect_questions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/buntings_nursery_ofsted_report.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_427f1c3c960c4031965851badd8f177e.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_dce0d465604144c0b91900c204f32eaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xetasif/75510482559.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_3139f40cc81d4e6b94381ed8894f60d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/24710497363.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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 5448 bytes
SHA-256: 26429ff4b06651a598116ad52aeccc58d73a3721dfdd10fdf7c4a9fc974ef000
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10648 bytes
SHA-256: 3c3ca2b3ff5c992fc1139a1acc842dcd080b2558107c684021734bb8a6605740

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