Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a9487e7ab2380b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-01 05:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaecc377752efaaa612f99c0d368ac71 SHA-1: c54210a73a46426ba9d78890e55e13558d17d460 SHA-256: c5a9487e7ab2380bc41217b2817b585142e3252912838fb17f3110f22c42a5f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a potential link farm or SEO spam operation. The presence of embedded URLs and the overall structure suggest it's designed to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/123?utm_term=ielts+writing+task+1+model+answers+pdf
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/xajebepazuseta.pdf
    • https://static.s123-cdn-static.com/uploads/4486206/normal_5fe258217e84c.pdf
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/rukajegagemajeduxato.pdf
    • https://static.s123-cdn-static-d.com/uploads/4485705/normal_60b2e935bf075.pdf
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/1772507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fipivuzigoge.pbworks.com/f/best_ps1_emulator_for_windows_10_download.pdf
    • https://uploads.strikinglycdn.com/files/b3d5a1a8-5c60-4a12-a69d-9e9488caed88/dictionary_of_deities_and_demons_in_the_bible_ebay.pdf
    • http://supatibu.pbworks.com/f/modeling_exponential_growth_and_decay_worksheet_answers.pdf
    • http://kiletejude.pbworks.com/w/file/fetch/144411651/numeros_ganadores_del_mega_millions_new_jersey.pdf
    • https://uploads.strikinglycdn.com/files/194d41f9-82fb-4902-bf4d-8a77fff7197a/85179601936.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144428880/lenejotejutewivideroben.pdf
    • https://uploads.strikinglycdn.com/files/4d486f3c-7d4b-4ae2-b746-31d409a3d7c0/john_deere_l130_pto_wiring_diagram.pdf
    • http://paderukut.pbworks.com/f/cool_emoji_copy_and_paste_gun.pdf
    • https://uploads.strikinglycdn.com/files/f2a2d534-1780-4949-bd88-35e9d3733b1a/how_to_treat_wife_quotes.pdf
    • https://uploads.strikinglycdn.com/files/f8990620-8370-4354-bd32-0c5f40b62d57/dragon_city_hack_no_verify.pdf
    • http://vimadutukad.pbworks.com/f/70649254461.pdf
    • https://uploads.strikinglycdn.com/files/ac2364be-6e19-4788-8311-aca769ba2e7f/8450188067.pdf
    • https://uploads.strikinglycdn.com/files/b8ce0fed-1a38-4754-8f02-83bc628672ea/how_to_run_code_in_visual_basic.pdf
    • https://uploads.strikinglycdn.com/files/74274c86-dbe5-4797-a50f-9d78f7dee4d4/beachbody_reset_meal_plan.pdf
    • http://zabodovojif.pbworks.com/w/file/fetch/144427113/how_to_stop_apple_music_from_automatically_playing_android.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144428376/99867638851.pdf
    • http://wejojixi.pbworks.com/w/file/fetch/144424425/ejercicios_de_razonamiento_lgico_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/df80d3d8-78b4-4e59-89d3-907be9e36240/bapelo.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_off00011351.bin
c0c595ca2d97029a0f1cc0f065289793479948ff07d54e9b4af5ab7c50f1bec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 5508 bytes
font_01_sfnt_off00012611.bin
a11e9f22132f1f53b7c07fcfbb1e2a523f14b25401e930fabf3a8284fa01546a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 11776 bytes

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