Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3e457343c2bd7b…

MALICIOUS

PDF

73.8 KB Created: 2021-05-20 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cde9766a65e4ecc22bef1bfae32cf250 SHA-1: 543207f69238a2ffc71812186243cb834f20b897 SHA-256: 3b3e457343c2bd7bd3b1a2d7ffaaaf49ea94ff6522ded35e07de68a5a5f3d5a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=rounding+off+decimal+numbers+worksheets+grade+5+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fdd7f7ca97c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_6022baa21c244.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/2360582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422879/normal_604e94abd11c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415783/normal_5fed1b0ac81b6.pdfIn PDF document text
    • https://fizabawizusor.weebly.com/uploads/1/3/4/0/134000364/7f4f065b7.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/8941835.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/915dfa76-edb4-444a-977a-e670494abca3/how_to_program_xfinity_xr11_remote_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cef8489-8bcb-4795-99a7-28c22925bdb3/10124396114.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/86678575898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9ddc56-5f2d-4fc0-8bc5-75c1f57052db/sherlock_holmes_books_amazon_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d703d0-adbd-49a3-abb9-e05c33673d65/navirutufatobafiza.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/13509310803.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/57266350827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0dc9c6-9e28-424c-bf52-a203c366f355/97821655773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc707c19-0412-4663-b870-1f60a522e129/eaton_fuller_diagnostic_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531817a5-2048-407f-b37e-d08e60f22d8a/supersymmetry_theory_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d16bbe9-c411-45a5-85e4-a250b512f021/the_magic_mountain_best_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a20ba8-6dad-4be2-9ec1-f1dd71848408/25853867775.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/wasuxofiwokikisijozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196c9eb7-677d-4189-9283-abaa976142e0/beats_powerbeats2_wireless_in-ear_headphones_wont_turn_on.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 5996 bytes
SHA-256: 1edf64f3a79d95ecd88a1d288bbc8ce5f2b5bdb6bce0cd717f2748491496b0fd
font_01_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 10732 bytes
SHA-256: 557131b198276d1194742502b9eae2582a67a471ab993faf53e3c0ca5c9f5613

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