Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cf29b3bab9dc74…

MALICIOUS

PDF

82.7 KB Created: 2021-04-06 08:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 178ab605709407a0360555d3edbdd75c SHA-1: dedee71ff8c50d82cc9e1972e2cfd6c959968fa5 SHA-256: 32cf29b3bab9dc748a19736232db9b8eba88898263800695650555d100636959
186 Risk Score

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 0.9997

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://druttle.ru/123?utm_term=candy+crush+soda+cracked+apk+free PDF link annotation
    • http://xiwakaravivomik.scienceontheweb.net/mirimewafagebuv.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/64667968358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_605df4912cde8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60622d0b5f98c.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/arthropathie_inflammatoire.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/tavenivazotorinepujor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_6057f9d31e69b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_60601a381c7a7.pdfIn PDF document text
    • http://iciko.xyz/rapibunulusejudbt2cr.pdfIn PDF document text
    • http://neo-tp.ru/caveators_consent_formtf7xy.pdfIn PDF document text
    • http://itdiscount.pro/lexoderogiwooue3q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fe33e6046319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_13b9c7f122b84ba898f58b6f28aaa2c5.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_91dea38f6e0a43fa93e402c25252c733.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/is_nikon_d3400_full_frame.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_b137135eef3d41ab8b815041fc493d7f.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_4059329c1cd448ecad95a03f61c86eea.pdf?index=trueIn PDF document text
    • http://telusomabufa.onlinewebshop.net/vanifur.pdfIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_12e7886e4de64e0f9513e4365649fe16.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_cb37664ea68142619596ae612818fc25.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_e65d2230c5bf421e8abc87b1b6f937e3.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_307d68a7588d4b7889a653da34589c35.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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 5280 bytes
SHA-256: 2884db5002ac3b97b196bf9d8e6d28346bfba6fd4d2504ec831185458085a1a4
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 11816 bytes
SHA-256: 2b9f803891f83db29c100cecb433b005a994cdfa89b5aa0d4a6c1f9e79215552