Malicious PDF — malware analysis report

Static analysis result for SHA-256 b644c9b5396ba632…

MALICIOUS

PDF

115.6 KB Created: 2021-02-25 23:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 67fe899ac86e264fd7b0852970bae816 SHA-1: 27e5b2839dccb1b058d5e3c2ca0e9be2a93fac82 SHA-256: b644c9b5396ba6320f5cd2cf60befe59dd594c5635b9c4534b4e45df72b7f0bb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to search terms, directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=who+is+tessa+in+after PDF link annotation
    • http://vijexibat.mywebcommunity.org/16374307671.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/tabletop_rpg_games_news.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_5fefa852cb6b1.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/recipes_for_air_fryer_pork_ribs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_60216b78196e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_60007fba9987f.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/H7ibB9U/jepuwefawomekatuxuravezep.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/kigizijanamezet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5feba567ad90b.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/lamborghini_gallardo_superleggera_top_speed.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/xZhfiem/alan_walker_beats_piano_tiles_dj_mod_apk.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/7046033470.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/kegikifelisuxeretol.pdfIn PDF document text
    • http://desokore.medianewsonline.com/will_there_be_a_series_2_of_alex_rider.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/81546815642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/why_is_blue_light_flashing_on_hp_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/bee_bot_game_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/31681080469.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/ayushman_bharat_scheme_application_form.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_off00018de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE5 4836 bytes
SHA-256: 939352643cdee430e6f2b8035c01d8497db454407d23e9b58342b57cc28a7a86
font_01_sfnt_off00019e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E5E 10200 bytes
SHA-256: fb77316a2acf446a09bf4f29db4899c7727ae8439e590cb48e6b2e80fb2c3af0

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