Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0a3cc561b5bebc…

MALICIOUS

PDF

80.1 KB Created: 2021-03-08 06:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: eff3cc03308ecac4be7a614faf49c19b SHA-1: cfb788c3fb241a66d61f0563da7792bd207f9136 SHA-256: 4c0a3cc561b5bebca0b6c0952069b719521492d5d50dab5ea4224d58befc9fde
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable domains and hosted on platforms like Weebly, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. The embedded URLs and the PDF structure itself are consistent with this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/wix?keyword=pushbullet+apk+uptodown PDF link annotation
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/terorodewudegi.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/google_maps_api_key_is_missing_wordpress6ur3t.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/seraromodea6rta.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/wezejaxasowodot-giverifos-vugotowurawumen-risep.pdfIn PDF document text
    • https://zewijevatijafat.weebly.com/uploads/1/3/4/2/134265582/612169.pdfIn PDF document text
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/zosokeberi.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/fixake_webagetaputura.pdfIn PDF document text
    • http://pagebake.com/vlc_music_player_for_pc_free_downloaddk3z2.pdfIn PDF document text
    • http://tcerkovniekupola.space/nccn_guidelines_for_patients_pancreatic_cancerl9mpi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3dc3c8-76fa-4f41-8f4c-4057a27e5a86/oracle_sql_dumps_for_certification_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/star_trek_discovery_season_3_episode_6_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8cb7b79-13cf-4c16-af38-6851d36f416a/cleaning_keurig_2.0_with_descaling_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5636a32f-c83a-4662-a5b1-a7427365f1c4/fire_and_ice_jewelry_candles.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/heat_of_formation_carbonic_acid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd1bba9-2d87-4462-ae64-5d3a1530c31e/evh_5150_iii_lbx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1e0261-4f80-4b66-a7d2-3b878f142d92/railway_omr_answer_sheet_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2623a9dd-1575-40aa-b4ec-7e13cf486ea8/parkour_near_me.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_89ccbc7f8ec049bc909e53b1e29cf953.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_d2793762df1d47429e36b1650eb493ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04639b8-1f27-47c0-a18f-d88d9c3df61f/how_to_combine_files_into_one_in_foxit_reader.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 5248 bytes
SHA-256: 9bcd7fb8d182e82d3c8603dc386fa9062ab4c649017f327eff468fb3800bdc33
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 4784 bytes
SHA-256: 577c836d6cb7cc228cb200df8bb8ccf82fdab860c86d899a2a4ff7a94c47b6b5
font_02_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 10108 bytes
SHA-256: 359a8434dce62feb3640c673d37262d548886f9ea077eb1156ada142307b834e
font_03_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 16116 bytes
SHA-256: acdc7345fd7c724e0f83f99756c334a81566d7f1ced1780f830934d9e28cbf4f

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