Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b5d53d049eca07…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 11:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: abd630b28302b8b3727dfbc6360e9e4b SHA-1: 8afbd04cb3c5c7e87f812b363ed30f5417130870 SHA-256: 40b5d53d049eca07efb2ed98e5e7868c72e0eeedeb547e0d42a9901eac270f38
186 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 0.9999

Heuristics 6

  • 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.
  • 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://dafemum.ru/wix?keyword=hay+day+guide+book PDF link annotation
    • https://cdn.sqhk.co/tefozakozup/zRhfJni/business_simulation_games_unblocked.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/29bf94.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/efAJjhH/konami_otp_token_world_worldwide.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/1465466.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/24347ce8-6c19-46af-aab8-8ea1f55829de/ximekixa.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_1a4792848bdf4732961cf4a6a8e72593.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21c44f6-647d-404e-a059-345d73a5e157/15247742128.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_56d74e2161b04520b6242fcdbb05c88d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebffab0-c409-4437-8695-68c3dac4d6e6/cuanto_equivale_10_milmetros_en_pulgadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9952d8ac-39ce-4373-8f93-df145935971f/jagapediwowomunesixuxoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203b1547-a3a8-4fd9-a73d-e9ae70ee1f59/wiwejokolaridi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd64220-b360-440f-88e3-2d13df5d3fb9/60148303617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cefa989-047a-42ee-be2c-b202ab659259/7073832269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3d2ed0-8be4-4b83-840c-8f89f3c3d1b8/kewiki.pdfIn PDF document text
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_5c830c5235994924a6b3ce2eff46062a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0648eac1-7d01-4ae8-ae6f-f8e75a37d106/68952802324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecb4f2d-0c1e-4a26-a6bd-817dcf486f17/73790589867.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_ba0995d3869944cc86665d1d3988caa4.pdf?index=trueIn 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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 4956 bytes
SHA-256: e2f9a3c70da6f25419725241ce41e568ec5df8b266855b7862c404a18936ad6b
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10932 bytes
SHA-256: 0da504394fe406b3e9425f184cf5cedfe518df3eafdb95e14804731da1717b48

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