Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9a73b99b05e1cd…

MALICIOUS

PDF

72.1 KB Created: 2021-04-07 01:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b02cc475ab445256436e69ecc3efd9e SHA-1: 76ad4b43a30838e3572cd8f082958477c6fda538 SHA-256: 1c9a73b99b05e1cd3833adcad5c03fc1b6a8d267216ea0f3351686fac06a3245
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL leading to a site offering an 'award' related to data analysis. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=qualitative+vs+quantitative+data+analysis+pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_606bbbfc8921b.pdf
    • http://xevusezes.medianewsonline.com/data_structures_in_cpp_tutorial.pdf
    • http://xegazinijitup.mywebcommunity.org/21643002327.pdf
    • https://static.s123-cdn-static.com/uploads/4367621/normal_6006f3047aa70.pdf
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601bda20dc592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nafibanefexex/xaxivexinixina.pdf
    • https://uploads.strikinglycdn.com/files/73516ad3-e8ec-41e5-b4da-826b6991531a/how_many_food_allergens_must_be_declared_legally.pdf
    • http://sajififavaw.epizy.com/senexigenorikekupibejogu.pdf
    • https://uploads.strikinglycdn.com/files/460ed793-513f-4cd8-8bf8-43bcbab494d6/software_development_engineer_in_test_resume.pdf
    • http://pewusufep.epizy.com/nespresso_cs20_milk_frother_manual.pdf
    • https://uploads.strikinglycdn.com/files/27c6152d-be6a-465d-8ea0-a91273856f04/judidetufu.pdf
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_451d37314b544a4ca789fcc85685486c.pdf?index=true
    • https://s3.amazonaws.com/gebukil/how_to_study_dentistry_abroad.pdf
    • https://uploads.strikinglycdn.com/files/b7fb911c-771f-4967-b77c-dfd354ae1bc1/korean_alphabet_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/d994fd31-7035-4727-abfd-898d2e32c452/20566293147.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_62e62f8064194bd0a91c977865e9cc3f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1b.bin
69e21c11dfff339019866719963f675e63f1bd17bf6cdf106e32759316e8470f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 5288 bytes
font_01_sfnt_off0000f03a.bin
8163d3ac9b8c969ae09ffc373c3710561a60f67c24501ed8bbe1a2fdce28954c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10304 bytes

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