Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9f51db4c740f42…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 04:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 94d68c48a3daf2db7fb3e3be002c4d39 SHA-1: 53d21082f3553d5a54fd17cb4260e61fc00ac64f SHA-256: fa9f51db4c740f42c3aa7d10015a7da32bf848ddbe9e061a197c73492ecce996
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=what+is+root+cause+analysis PDF link annotation
    • http://martakkord.ru/33149765013xldwe.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/iYifqVH/61435339185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_600802545db38.pdfIn PDF document text
    • http://matrixbicycles.com/nedevexibobegenejugemuj54cf.pdfIn PDF document text
    • http://nasporte1.fun/28566493350qszjf.pdfIn PDF document text
    • http://farvestnn.ru/speed_queen_washer_black_friday_sale1543v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_60173821efaec.pdfIn PDF document text
    • http://fogozuvonuw.66ghz.com/elevator_saga_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/romafime/iiP5Hic/88252112120.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/hfgimhc/53541233266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fc8305774431.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/VTmjOjj/venazenizenuviwuludori.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/e00b36d4-91a5-411b-a4a9-20fe9d27a282/toshiba_audio_drivers_free_download_for_windows_7.pdfIn PDF document text
    • http://xitevilejagen.rf.gd/best_android_phone_camera_verizon.pdfIn PDF document text
    • http://biponutagovom.rf.gd/common_english_words_used_in_daily_life_with_meaning.pdfIn PDF document text
    • http://xafofeb.epizy.com/wovojulegofetidilitim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50ad74d-f61f-40a1-8975-1220e6f59ec7/autodesk_sketchbook_pro_free_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/kptcl_recruitment_2019_notification.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/microbiology_lab_exam_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf11997d-e435-42ae-9435-8c1bffa33a7e/dinoxigarudexamo.pdfIn PDF document text
    • http://luxetejafolakem.rf.gd/99853273026.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 4884 bytes
SHA-256: c8ebb92943c3935ee1952a3961bea4ff6c46920d4d101a6eb7ca094a6318111f
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10236 bytes
SHA-256: a3d17cff6d1fb128284ae4145b8de6e46bc4cce68f07f3cab852c0aceb36fc81
font_02_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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