Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17ea0bf62c5f158…

MALICIOUS

PDF

73.0 KB Created: 2021-04-14 14:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3b585d87b6bd9d7660d3aa0b6f474a0a SHA-1: 58c8c129a37b7f748d97a2a514590b9641614fb3 SHA-256: e17ea0bf62c5f158a6c90506f041213b609097ce6393959330296fe6d58e05ea
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-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://golowaki.ru/strik?utm_term=act+book+online+free PDF link annotation
    • http://martans.space/descriptive_geometry_textbook42wx2.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/fisher_paykel_dishwasher_repair_townsvilleemvp1.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/ha8hjeR/19547868954.pdfIn PDF document text
    • http://zoneeuro.pro/779161175927qsv2.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/mijebof-besidopaji.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/miwolunedi.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/fd1d709.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/kCiehjh/45756426781.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/LRjeEhe/the_chosen_episode_2_plot.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/c2248b5f65d.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/lefenedulitagoximoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jeFhio4/beeruva_movie_songs_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_606b769ed039e.pdfIn PDF document text
    • https://valejuti.weebly.com/uploads/1/3/0/7/130739952/a6899.pdfIn PDF document text
    • http://carinsusa.com/how_to_write_a_good_review_for_a_movien58y4.pdfIn PDF document text
    • https://tupenozisi.weebly.com/uploads/1/3/4/0/134012303/2250562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_601fa0f68af60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_6041e2863f705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_2bdd887c17cf4b56b9b647cbc3fcb2a4.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_b8172845469741658cbfed39a42b3acf.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_e2dce6c75dc14b6bb26d5f38d7f34112.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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 4680 bytes
SHA-256: 8fd02a2a695568c8cd794d37fd72c5724c7aec17b6d3bb384d606c7526b34133
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10864 bytes
SHA-256: 9f4a376bcc1009ea9aad1a1e19239f1fd30c2d3de7024a26fd9619e3aa45915f