Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d8bc463ed644c6…

MALICIOUS

PDF

82.6 KB Created: 2021-03-05 19:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b9406f166adb52b2f63a901bcbab9a6 SHA-1: 89e4652d336ccc405ddd8009bd0ef71d8a5dc6d8 SHA-256: 76d8bc463ed644c6a90e1b4a3bb3776c68ac95ae1458e91ae872920540f514c2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common technique for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://jottigo.ru/strik?utm_term=dbms_stats.gather_schema_stats%2528ownname%253D+%2527%2527+cascade%253D+true%2529 PDF link annotation
    • https://cdn.sqhk.co/banijuwa/jhdjg9h/xenupukisoginajigiduzo.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/hdOKSgc/cod_cold_war_beta_dates_ps4.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/refakoxaxekawupepezi.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/jemfjgJ/ates_ve_su_3_oyun_kolu_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/iiHhhje/bangla_voice_keyboard_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/gdhjdjf/light_it_up_lyrics_pop_smoke.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://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_9b1b39b993df4abbb315d8ee6880169f.pdf?index=trueIn PDF document text
    • http://melaworogafema.epizy.com/makuze.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_052169e72ce04a9885154438c7bba279.pdf?index=trueIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_841b764ba5f142439e7ca88c58b86177.pdf?index=trueIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_f0bc730ae54e424781dc6f09d3ec9893.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/wevoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6521543-0c87-46c3-9bef-3c1da38adb80/19751226315.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_5496b2064118442b926d59accb53fb28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/pivir.pdfIn PDF document text
    • http://xamufalifab.epizy.com/11969998732.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_ebfbe673e02f4191855cc12fb419541b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/18702719758.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ddc229c6af9a416fa80bedb677f10671.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_193a0ad1b3064a1abf1b107245b7cd84.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_f458b7d069da4b35a3541a8501eb648d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33018c1b-c91a-453d-9830-f9e85cf8cee2/sepujofasufavisemoroje.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/hercules_hoists_ltd_annual_report.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_def39a243def4691b5a478235db3359b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3782ba22-6a17-42f6-9252-27ad5d9620d4/oster_clipper_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/76548902493.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5684 bytes
SHA-256: 10fb4e3a72eb08352b5571e9409221e4e87709c8d48db8ea35be0b3011f3859d
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 15092 bytes
SHA-256: 92f7ee06e4af45fcdc6183eaa4c5ef1840fac68d6d76911462d63dcfed1b34d4
font_02_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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