Malicious PDF — malware analysis report

Static analysis result for SHA-256 65529c6094dba0b2…

MALICIOUS

PDF

80.3 KB Created: 2021-04-04 02:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 481152e346903cf389ab6d54ec28a5bc SHA-1: 2d8fc1ffad0b9f8b998d1afb2f545ca13eb2b5e8 SHA-256: 65529c6094dba0b2099f328348059e26116e41917f8d1e0749b05c35d88b6af9
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=toro+824+xl+snowblower+carburetor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449992/normal_60571fc624491.pdfIn PDF document text
    • http://navaram.online/lac_rouge_de_lokris25h4w.pdfIn PDF document text
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/19a52c3093.pdfIn PDF document text
    • http://probnik1313.tech/flying_monkey_jeans_wholesale2601x.pdfIn PDF document text
    • http://natur-green.fun/225203819318dxn3.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/7212445.pdfIn PDF document text
    • http://supsun-aero.com/descargar_biblia_reina_valera_1960_gratis_para_celularesp6ukj.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/kozepusamumukuxebigudlllbx.pdfIn PDF document text
    • https://lojanoper.weebly.com/uploads/1/3/5/4/135400197/08fd6710e54cd74.pdfIn PDF document text
    • http://onsideball.info/year_planner_template_free6h06x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462775/normal_605b12e4435b6.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/libebi.pdfIn PDF document text
    • http://trychambre.xyz/msi_z97_gaming_5_m.2_support2oibh.pdfIn PDF document text
    • http://it50disconto.pro/11160214283dt38c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b395e95a-f5dc-4b3f-87a0-b148628f0642/20247120716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2419c2e1-deee-46d9-97f3-8bc7367ec710/giwax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc8fa81-cfb7-432b-9fc0-7111d62e657d/analisis_literario_del_libro_el_caballero_de_la_armadura_oxidada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8584f7-6abb-4ebd-b9c9-e2a1cba45a1c/if_he_hollers_let_him_go_chapter_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925c38c6-e532-491e-acb5-e84e343460e2/pentair_intellichlor_cell_replacement.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5288 bytes
SHA-256: 15b1db7af999fc0d4ebb4145a63146cca9f8be0dcc1ecd916ef0205806b1a24e
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16288 bytes
SHA-256: 0bf7939d450d2636adee8167d638a69ac2d0042bb3f8f4ed2bc257436fac294a
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2