Malicious PDF — malware analysis report

Static analysis result for SHA-256 decd0e6f6d524c89…

MALICIOUS

PDF

104.0 KB Created: 2021-03-14 06:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5743f4135b60f4b18533594c2ff18fbd SHA-1: d56bb6923440c15e3a740578540b3f88fcd434e9 SHA-256: decd0e6f6d524c89f1f68c39d759310308d7473012ae9b86da20f503bcbf6ff5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=esc+guideline+valvular+heart+disease+2020+pdf
    • http://molotkov.site/noxazowugozan3w5m.pdf
    • http://ig-soft-team.com/wowofuzedaxavuzejapaj3h8vj.pdf
    • http://sewukagazub.mypressonline.com/psalm_23_4-6_commentary.pdf
    • http://womenit.space/xozapemozizwhgv.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/makuwaxu-datowuk-lekapojik-xolukovazov.pdf
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/nosaderijolik_nowas.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/45778f6.pdf
    • http://negozio50sconto.info/how_long_do_dyson_batteries_lastey906.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/how_to_clear_memory_on_hp_officejet_pro_8620.pdf
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/3324032.pdf
    • http://idem-peshkom.ru/tikewazorajewapozujfw9ck.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_c2cfb9f915664d509bafe609243e9e39.pdf?index=true
    • https://uploads.strikinglycdn.com/files/770af4d0-99d3-489f-8bd5-757a651ec887/weninozopokonasubuku.pdf
    • https://uploads.strikinglycdn.com/files/fd7cb3fb-16ee-4cf8-aeb4-edbaf8d60aa6/where_to_buy_oreck_xl_vacuum_bags_near_me.pdf
    • https://uploads.strikinglycdn.com/files/bee5762c-50cf-4d5c-bb29-a33d73060d77/digitech_rp250_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/3db5a4e4-74bf-468a-b470-370d0a8fae7b/58139840368.pdf
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_98cbf50789e6459f9144619f8fbc9496.pdf?index=true
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_4e3854c81ab04d5388d8eb5bd3971b1d.pdf?index=true
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_562599624a6848b6ba4d9c0277b1a66e.pdf?index=true
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_ef414915df814d2da105333f607d2ff0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2ba4785a-e688-474a-99d0-f8dc5364fd1c/d_and_d_auto_repair.pdf
    • https://uploads.strikinglycdn.com/files/f233927f-6952-46d6-a86a-d2af6c7490bc/irobot_roomba_561_battery_reset.pdf
    • https://uploads.strikinglycdn.com/files/3de90af4-7ada-4e18-b623-032ca211df6a/do_hvac_techs_make_good_money.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_off00015810.bin
f01cb5e1bc88312b1e3fcd12ad6face8b8fee3b1d762d1533d342c7ecdab131b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15810 5708 bytes
font_01_sfnt_off00016b88.bin
25d80f429b501c7d39c3d2ed0571fd01b74bcca528418f80126c58470186c803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B88 10840 bytes

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