Malicious PDF — malware analysis report

Static analysis result for SHA-256 9746e53bb670e657…

MALICIOUS

PDF

104.2 KB Created: 2021-04-16 07:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 501947a4a2fc2c884f82f7f28a92c230 SHA-1: b2572b41c1088901df2c9b7c1fcc88d63ba9edaf SHA-256: 9746e53bb670e657f6c4824bba17aed689c4dc400a85c1102fd3cb190956a7a3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The primary malicious URL identified is https://mezovuduw.ru/strik, which is presented as a search result for a popular media query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=attack+on+titan+season+3+ending+song+mp3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fe59645388f6.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/jjjhUA2/chart_showing_pounds_to_ounces.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_606c9750942a9.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/fHkajeb/riwoxodovimixepozubel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_604cc87cdd89d.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/iifhghc/95088991155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492593/normal_6008d5720d924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_60254eaecf233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_602eafbad4b5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fd3a34faf1cf.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/Z3uifDO/artsy_craftsy_website_crossword_clue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471946/normal_5feffd8260e76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f0ded7c6-1882-44c2-b580-3fd8daacf182.filesusr.com/ugd/1cd4ca_8a79afa0b59d496c82edcc306048dc41.pdf?index=trueIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_ddc13f88d2a1425aa273ab4a01bdc498.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_1b20e5142f2b428c96d27d5fbe2ccadb.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_ec0ede3292a44df5833b1e62f2e4d305.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_0833655a4b174bb4b4f2cae511d69604.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_de07c691c289497c93a703500209386c.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_54b91edca8334a9eb072635bd6603c15.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_edf00a81c5ab4aefafad247add20dc85.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_ca317ae3e5544633ae113244a776edfe.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 9448 bytes
SHA-256: 1ae8e4687975cbdb9b9c29a7d2f596265e40e49c9e40c83c27b8110c9118b9cb
font_01_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 10752 bytes
SHA-256: f969b6b73bcc9142dab76ebcd49994981a74b40554e3eed1fd1f3a58e4f60a7a
font_02_sfnt_off00015106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15106 5480 bytes
SHA-256: 11d78dbcaed3a29630ebda23ae9064f4aa1654eb9fa1330cbe4ee027b33f343b
font_03_sfnt_off000163a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A5 13632 bytes
SHA-256: 0a5e0f5540f082893e2211a0b171f3c2a64c2ab54e5555f9c90994a0e18550c6

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