Malicious PDF — malware analysis report

Static analysis result for SHA-256 423506dc736dcc71…

MALICIOUS

PDF

79.2 KB Created: 2021-03-30 13:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e152a21e6ee46cfe494508d8ddd28baa SHA-1: ac337d9c07b26578a03ea1007cbc02c746bcad35 SHA-256: 423506dc736dcc713feb90d5fde860df788133644a951c6f8f5bba2affebe170
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with at least one pointing to a suspicious domain ('lozipotod.ru') and others to potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/123?utm_term=zalo+tr%25C3%25AAn+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383460/normal_6001f2f011745.pdfIn PDF document text
    • http://sobakin.space/how_to_draw_a_child_walkingauymp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5fe50ecd6a7e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcb62786820f.pdfIn PDF document text
    • http://crispyset.online/harry_potter_book_5_chapter_123z8kg.pdfIn PDF document text
    • http://sluzhba1.net/10199272740yiykf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_605bcc9709305.pdfIn PDF document text
    • http://50offshop.pro/64537400139r10dz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5fe0917691ff0.pdfIn PDF document text
    • http://org-fruit.space/tinejijunuwedizaxugobe08f80.pdfIn PDF document text
    • http://hookup153.online/torsional_pendulum_mastering_physics_solutionfwc6h.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/pevuwarobuvowa/acordes_de_guitarra_digno_eres_de_gloria_y_alabanza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e06acd-cebf-4094-afb6-e8fa9d0435a9/soguputebomubuzowanifotul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56984a47-02ed-4fc4-9add-65bc6fb5d0d0/74852109884.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/aaron_becker_journey.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/rimoduxusax.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/canteen_automation_system_using_android_source_code.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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 4876 bytes
SHA-256: c7c04fac64d1c8cbe64e64504d37b75aee314bb5af3ab0e3ce3eb50156f0e096
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 22588 bytes
SHA-256: 27f023fb4d65a2de4f588739ef07d9b37565baa7bbbbdb9a15b360957534ccae

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