Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bb4a4a3a7fec03…

MALICIOUS

PDF

86.9 KB Created: 2021-06-10 01:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba827759946d2d92192d326bf82fdea3 SHA-1: fb1e7470b11d0af63c67c8935e9cafbc863451f0 SHA-256: 99bb4a4a3a7fec03a8a0ab1b1a702a4f9dac5e6e2749c66789151da8f6583f11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a malicious link farm pointing to 'https://nomylo.ru/pbw?utm_term=ssb+ultimate+dlc'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing content. No scripts were extracted, but the structure suggests a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/pbw?utm_term=ssb+ultimate+dlc
    • https://folozulo.weebly.com/uploads/1/3/5/3/135351090/065d7d2813.pdf
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/lufoz-momedafulowu-jukawojozut-kerisagezobedig.pdf
    • https://birijejukuz.weebly.com/uploads/1/3/5/3/135386669/d49843aff75.pdf
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/wedawirixajitapa.pdf
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/nefon.pdf
    • https://saxigixerugeri.weebly.com/uploads/1/3/4/5/134585582/dapotilinozon-rituj-sepor-rixupojod.pdf
    • https://latuguno.weebly.com/uploads/1/3/1/6/131606113/100309cf0178e76.pdf
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/vosuletov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bokibagaror.pbworks.com/w/file/fetch/144655860/how_to_download_mask_aadhar_card.pdf
    • http://pusavivo.pbworks.com/w/file/fetch/144448818/how_to_use_philips_air_fryer_essential_xl.pdf
    • http://xugatun.pbworks.com/f/ponniyin_selvan_english_part_2.pdf
    • http://zipiwume.pbworks.com/f/judul_skripsi_pendidikan_agama_islam.pdf
    • https://uploads.strikinglycdn.com/files/e9129c02-1445-4031-9618-a7bf7aacd1eb/solucionari_matematiques_2_batxillerat_mcgraw_hill_unitat_6.pdf
    • http://wiliser.pbworks.com/w/file/fetch/144684798/tisepejepowudapuvimim.pdf
    • http://gonikob.pbworks.com/w/file/fetch/144760122/pokemon_rejuvenation_v12_relationship_guide.pdf
    • http://feselikebapu.pbworks.com/f/betty_azar_understanding_and_using_english_grammar_3rd_edition.pdf
    • http://negovijalulu.pbworks.com/w/file/fetch/144411777/47376273231.pdf
    • http://xodelow.pbworks.com/w/file/fetch/144452175/18160438270.pdf
    • http://vutajake.pbworks.com/f/lowemupukabedefajunesake.pdf
    • https://uploads.strikinglycdn.com/files/dd40358b-0d5e-43f8-b55d-b537075fd56b/why_is_my_he_washer_not_getting_clothes_clean.pdf
    • http://didaneguk.pbworks.com/f/vetekofibunugor.pdf
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144724995/displacement_velocity_and_acceleration_worksheet_answer_key.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035f.bin
996ce666269cad2f69d00499bc82e9a7a0c4087a496838b660cc7251cc27e8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 5468 bytes
font_01_sfnt_off00011602.bin
300b2d0126e0af7f8e1073fb4efe894177941a36492347873982f203d70c4b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 5232 bytes
font_02_sfnt_off000127b1.bin
68bc409a37cd04e9054b07dccbbb8992f1a706c89fe2a281afa9be087cd10fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 12728 bytes

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