Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b48a5646d4aaa2…

MALICIOUS

PDF

72.8 KB Created: 2021-01-28 08:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 111cb1aa3fe7ca4462d18841918e5c81 SHA-1: 4075d2f1dd86dd1865fd7dcd24f05503a32c5f8b SHA-256: 23b48a5646d4aaa24938f1fcf871ee4fbe61c8c44cdd853a706d154041b04868
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://baarspo.ru/123?utm_term=eclipse+portable+media+player+model+t2810c PDF link annotation
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/faaa341272dab21.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/dhaciTe/happy_birthday_friend_girl.pdfIn PDF document text
    • http://fovuvizoge.22web.org/the_last_kingdom_season_3_episode_guide.pdfIn PDF document text
    • https://rabifitirigi.weebly.com/uploads/1/3/0/7/130739094/3027386.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/takawexudi.pdfIn PDF document text
    • http://woravijida.22web.org/namivuwoxagat.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/Hjeiavu/62747923706.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/id8giGY/download_game_days_of_decay_mod.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/f1f32c9444e.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/iWoYEjd/voltage_drop_parallel_circuit_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/yCJIljc/retroarch_xbox_one_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talagamezibupip.epizy.com/85735578085.pdfIn PDF document text
    • http://begilokikilox.rf.gd/vshare._eu_video_er.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/citrix_secure_mail_user_guide.pdfIn PDF document text
    • http://xarujubapemir.epizy.com/quizizz_right_answers.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/90431166267.pdfIn PDF document text
    • http://wexoloxi.rf.gd/99045219986.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 5940 bytes
SHA-256: c1bfa171ac3e728ace7a5fdd87f2f679614baa436af6b2fd81df8de53a586cb6
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 10624 bytes
SHA-256: 54e566efe3eabb229b770d408aa2b0bf4cb8f867df56662078d4bdd415fd5003

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