Malicious PDF — malware analysis report

Static analysis result for SHA-256 074b36d2a6f424b5…

MALICIOUS

PDF

74.8 KB Created: 2021-06-14 07:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea568c64fc07b903234a38fb442253be SHA-1: 27204fe05e4f08e7252cf588fe90f8badb6d5acc SHA-256: 074b36d2a6f424b5756771f9c8a2f89afff6acb5264dd005b5d9383c3ecdc7b9
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_SEO_LINK_FARM' heuristic point towards a malicious workflow designed to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/pbw?utm_term=free+oldies+ringtones+for+android
    • https://cdn-cms.f-static.net/uploads/4468530/normal_601a388f8158b.pdf
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ff587f02803f.pdf
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5feb4f4730250.pdf
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/vefijotok-sazoxubofa-rogalerowamar.pdf
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/pirovulu.pdf
    • https://cdn-cms.f-static.net/uploads/4501509/normal_6056414b6711b.pdf
    • https://cdn-cms.f-static.net/uploads/4498994/normal_60bb1d98d4e29.pdf
    • https://cdn-cms.f-static.net/uploads/4464297/normal_601a45cb9bf01.pdf
    • https://cdn-cms.f-static.net/uploads/4451950/normal_5fd28afe2f9d9.pdf
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5fce01f8aeb5d.pdf
    • https://cdn-cms.f-static.net/uploads/4490265/normal_600bab88a550d.pdf
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fdd62460bb19.pdf
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/8830142.pdf
    • https://cdn-cms.f-static.net/uploads/4406169/normal_606d5752660a7.pdf
    • https://cdn-cms.f-static.net/uploads/4393635/normal_60c1fefbf3275.pdf
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/jepaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nidibewuzi.pbworks.com/f/how_to_fix_your_tassimo_machine.pdf
    • http://xujefix.pbworks.com/w/file/fetch/144779466/saputinemose.pdf
    • https://uploads.strikinglycdn.com/files/6d9b817e-5e87-4e25-8247-f0d83af01cec/duzivesakefitukarufok.pdf
    • https://uploads.strikinglycdn.com/files/8320f6e8-5645-452c-8e9a-582145166e92/63482806382.pdf
    • https://uploads.strikinglycdn.com/files/aa5f2707-b0b6-4ce3-b301-4b63b1ef3a25/98622977661.pdf
    • http://siseraxoru.pbworks.com/f/how_to_calculate_the_ph_at_equivalence_point_of_titration.pdf
    • 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_off0000e8fc.bin
0c0206a6e0319472fe701c7d4cf0f9a52a175bab39b94247e5338a50a658a8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 5028 bytes
font_01_sfnt_off0000fa28.bin
282daaf66301a2b60c9b9bc16d87c8cb9d960a1cace110a10c29cff73ebddcd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10396 bytes

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