Malicious PDF — malware analysis report

Static analysis result for SHA-256 895becec07d39216…

MALICIOUS

PDF

88.7 KB Created: 2021-03-01 13:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b85b7cfbe2a2cdb4d5f80f9c9d727c94 SHA-1: 84c17162149f1518b2718d1fbfecb8ee6df9291e SHA-256: 895becec07d392166a63ad74e4757870fb97702d09890c11ca62b769cd03a337
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to a medical query, and numerous external URIs are embedded, many pointing to disposable domains. The primary malicious URL, 'https://nipisod.ru/strik', is likely intended to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=what+does+it+mean+if+u+have+more+discharge+than+normal PDF link annotation
    • http://liwexun.mywebcommunity.org/how_to_unlock_a_sentry_safe_with_dead_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/ijciiIf/shark_attacks_seal_off_nauset_beach.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/56427266203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427295/normal_60000c636e7e7.pdfIn PDF document text
    • http://ag-management.space/twilight_saga_movies_ranked3b7y0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_601aefb5ac3a4.pdfIn PDF document text
    • https://cdn.sqhk.co/vufuvevu/WLibVAO/snowflake_drawing_easy_step_by_step.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/google_cardboard_apk_android_4.4.2.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/hiiwHXL/food_giant_medina_tennessee_weekly_ad.pdfIn PDF document text
    • http://aycotoro5.xyz/greek_gods_names_list2vnh5.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/68618347411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xurorovesi.epizy.com/gouty_arthritis_clinical_practice_guidelines_philippines.pdfIn PDF document text
    • http://legabukev.epizy.com/88019333805.pdfIn PDF document text
    • http://javozajesaretu.epizy.com/lopumitemonusa.pdfIn PDF document text
    • http://sefibonep.rf.gd/18212661456.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_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 5508 bytes
SHA-256: 7b24df4f7a39d2b8c0a43dfbbc1ac4c1514c67727d97797a1722dd0672c8b321
font_01_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 11400 bytes
SHA-256: 8bc7cb3e75e69fced3847c6404b8d498e8e0075ec0cdf9414e47d4e68d820c62

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