Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d5129361edbc70…

MALICIOUS

PDF

76.7 KB Created: 2021-01-31 09:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf4178de2aab5ab25381c7eaf33cd988 SHA-1: 1aee0577f6d0d4d9d96984c4bf36369d432f2aa9 SHA-256: 90d5129361edbc700360283ebf6a4a9f080380dff50c006c60a07911097d2796
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=mukwonago+high+school+athletics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469349/normal_60075ed4b0a85.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/igpiahg/top_up_diamond_mobile_legend_murah_dunia_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428061/normal_5ffa791f4ee99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5fe05f70e36d6.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/iibVWiv/70001324276.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/jdNPid1/stress_balls_gummies_reviews.pdfIn PDF document text
    • http://vnatural.space/did_it_again_shakira_kid_cudi_lyricst1y7h.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/tubozetidalosij.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/32241b.pdfIn PDF document text
    • http://steelsho3.club/arcade1up_pac_man_countercade_retro_arcade_gamebvdk6.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/RYjak8T/hydroelectric_power_plant_working_model_for_school.pdfIn PDF document text
    • https://jometuke.weebly.com/uploads/1/3/0/8/130874139/xixutili.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/gjgcJwY/slope_run_game_tyrone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_600ba98a5572e.pdfIn PDF document text
    • http://thefortykuti.com/volumuwadenidoxoch4i4.pdfIn PDF document text
    • http://buytoday.cc/ontari_danni_sena5iv6z.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
    • 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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 5008 bytes
SHA-256: ef5a253026baba6be7e5a5b5c8e3cd9fd4033b7691e292ab00c5008dedcd31a3
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 11172 bytes
SHA-256: 9f432fa3f6801e8bc9744af64a9dd653c499823a99f6f2a8a92a9b9c9ecf7f8c
font_02_sfnt_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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