Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86c4ed00e075368…

MALICIOUS

PDF

85.3 KB Created: 2021-04-07 01:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62f26a61f12d3edde2c4fdd287646401 SHA-1: d2749daa40d2a51c993219203ca99ad46fb1a822 SHA-256: e86c4ed00e0753684aa2b6970a1da39aac0f4db6a9d5a054bef5797895cfbf65
156 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 tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=how+to+zoom+on+my+mac
    • https://cdn.sqhk.co/wadupaxi/UOhhOja/dawomolu.pdf
    • https://cdn.sqhk.co/jujifefa/heSigKs/30846394381.pdf
    • https://cdn.sqhk.co/remuzebepilu/aKKINgc/pazozuzenawaninugoxa.pdf
    • https://cdn.sqhk.co/masezupusi/IgcSjhL/31680109577.pdf
    • https://cdn.sqhk.co/wibononuve/iiK42nP/coffin_dance_meme_song_roblox_id.pdf
    • https://cdn.sqhk.co/jupujezaxa/dbhiieZ/amazon_kindle_store_free_trial.pdf
    • https://cdn.sqhk.co/jesupesiparu/imGhaif/pixel_art_phone_wallpaper_gif.pdf
    • https://cdn.sqhk.co/wibetaxor/iajjfhd/the_last_stand_union_city_hacked.pdf
    • https://cdn.sqhk.co/nozedimasav/R9hjghT/30387491822.pdf
    • https://cdn.sqhk.co/vexerofexe/jbgj3id/game_lost_island_3d_mod_apk.pdf
    • https://cdn.sqhk.co/bipufawawi/k2wibie/xoxefaxifikogexofa.pdf
    • https://cdn.sqhk.co/dijadive/jfUgdhc/occupational_health_nurse_practitioner_jobs.pdf
    • https://cdn.sqhk.co/jupujezaxa/cW7hijg/95455997790.pdf
    • https://cdn.sqhk.co/tixukiko/ifGWidA/jalagabumom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/defipedibe/harry_potter_19_years_later_movie.pdf
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_25b611f6bfca4c509927d8fb4931d968.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_53c9224610654988bd0e87b45eb1408e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6ed9721-48e4-471e-832c-49a4e7778984/xefilifejaridefeluzitavar.pdf
    • https://uploads.strikinglycdn.com/files/fc1d1240-6d67-4acd-8653-6e9c4bf4d45d/18257434656.pdf
    • https://uploads.strikinglycdn.com/files/35184eed-e9e1-49e3-a4b3-d990870cb34a/how_to_add_a_power_outlet_from_a_light.pdf
    • https://s3.amazonaws.com/silubebebefuju/zakagemivixefezurixikos.pdf
    • https://s3.amazonaws.com/xefezesebusu/9844549065.pdf
    • https://uploads.strikinglycdn.com/files/2c31165b-3a52-4745-a66e-3fce23296493/how_to_adjust_a_motion_sensor_light_switch.pdf
    • https://uploads.strikinglycdn.com/files/1acacfb8-bf80-4bdf-ad51-750b3098396d/what_size_is_16_cm_in_inches.pdf
    • https://s3.amazonaws.com/tanikanaw/english_grammar_learning_in_tamil.pdf
    • https://s3.amazonaws.com/jezobasit/mivolanujifo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110a7.bin
a3d1a527bcfa13516a33e7a00c8344187cc732c0234672f5ae31a3fd3d0b5914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 4844 bytes
font_01_sfnt_off0001212a.bin
9d190ac179635542e28b802055b0e698a938e98d8a5abba0293d9aef7e3904a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10900 bytes

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