Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a4eb29469a51cc…

MALICIOUS

PDF

82.7 KB Created: 2021-04-05 14:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81ac6119042f90115e6c8f432a40356 SHA-1: 1e40f4a8ad04b4e5e703ddeb59a991326d91d14a SHA-256: c8a4eb29469a51cc457e3d635112bbaed39960a6413538b6305877723cf9b940
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF SEO Link Farm' pattern. The embedded document body, though heavily obfuscated, contains text related to loading software, suggesting a lure. The presence of external URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=load+printmaster+onto+hard+drive+mac
    • https://cdn.sqhk.co/sanojuxako/mfhi9Ms/mukimevukemaxun.pdf
    • http://crystal-light33.ru/how_to_be_better_at_muay_thai6zaz0.pdf
    • https://cdn.sqhk.co/lasesekov/d2kd3ge/41743182925.pdf
    • http://distornyup.site/beginner_harmonica_sheet_music_freer2dsg.pdf
    • https://jukuzowak.weebly.com/uploads/1/3/1/3/131379830/a7afcb.pdf
    • https://cdn.sqhk.co/dikarulik/hhEgjBO/kosir.pdf
    • http://onlineeshop24.xyz/6160192297oxyoe.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/bokaxomodorodak.pdf
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/lipuxetif_zituwevutusa_dukosufakaja_fafudabev.pdf
    • http://kalavar.xyz/laxizemobafinomerf8ddk.pdf
    • http://gbo.guru/serurevawowzz08x.pdf
    • https://rixabala.weebly.com/uploads/1/3/4/7/134730828/mivojumagajobi-rorizoma-zabugixovife-mewijewinaxiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/firudegix/78598112154.pdf
    • https://uploads.strikinglycdn.com/files/6a9a1bca-6548-4be0-9b2b-b7625efc5508/sokejofomoxufefelukero.pdf
    • https://uploads.strikinglycdn.com/files/2970dbca-a23f-45da-beff-1b535c1e8107/how_to_apply_for_a_job_at_kelly_services.pdf
    • https://s3.amazonaws.com/wazorixekunafob/how_many_bullets_does_a_ruger_lc9_hold.pdf
    • https://uploads.strikinglycdn.com/files/c21660da-2f55-45b1-985f-d4a2fd0f6527/frases_do_livro_a_arte_da_guerra_sun_tzu.pdf
    • https://uploads.strikinglycdn.com/files/d20decaa-9ea3-47a8-ba10-40fb2c6c1854/are_aisi_and_sae_the_same.pdf
    • https://uploads.strikinglycdn.com/files/6f59d4e9-e830-46ed-acd2-2c2bc23b30be/ethical_hacking_jobs_california.pdf
    • https://uploads.strikinglycdn.com/files/568257d2-c7a7-46b2-95cb-d9d995e09b39/prince_caspian_book_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/86777d58-1c35-4fe9-9c1c-a7e82b6d67d5/fiwov.pdf
    • https://uploads.strikinglycdn.com/files/976a0223-58c3-4503-a6f5-e37a74bdeed4/54769894995.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e229.bin
13ba5609a51330643c417203e10dd4f19772627f61e0f37bcd4f12dca2c86d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5280 bytes
font_01_sfnt_off0000f3fa.bin
26aaeb1d5b32bac62a67a7dc4ea6bb2a9da85907034f9779281ebe11235e8b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 2572 bytes
font_02_sfnt_off0000ff3c.bin
b855b10ea6a3d462005e1bb6b5758dbdc81cd3ee72c71979a2551be64c46dc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 11564 bytes
font_03_sfnt_off000126ea.bin
e4fbeb38030c3769964c1a5951c533a55f21893d08e7f16e9b1af1c698f23ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16300 bytes

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