Malicious PDF — malware analysis report

Static analysis result for SHA-256 4240a9907dbfe3f2…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 20:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 008cb9c80409e909a3c4e03a7d3e5b16 SHA-1: ed1b4478aa76059e19889c164cf997949b9024d9 SHA-256: 4240a9907dbfe3f2ba76faac220f67993caa3c26473b00c7674c379899ac826d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=waves+study+guide+answers PDF link annotation
    • https://wizamivakujeji.weebly.com/uploads/1/3/4/5/134526499/d9c9effc163.pdfIn PDF document text
    • https://gezanexeroviku.weebly.com/uploads/1/3/4/7/134756427/megifelos-verediliga-motunoniwe.pdfIn PDF document text
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/8f8fda3464.pdfIn PDF document text
    • http://sell-toclick.online/witcher_3_following_the_thread_choicescs53z.pdfIn PDF document text
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/47160177c8a.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/rorevogewuzisor_fefofujirix.pdfIn PDF document text
    • http://mrshadow.net/pinball_star_post_ledo8gzh.pdfIn PDF document text
    • https://tulidakavixesa.weebly.com/uploads/1/3/5/3/135347336/7364063.pdfIn PDF document text
    • https://gosizunasinati.weebly.com/uploads/1/3/0/7/130739879/d987c537.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/d56d05b7ba07b.pdfIn PDF document text
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/neloganuliti_zarunu_dosaxexepe_zowovosi.pdfIn PDF document text
    • https://vanoxurele.weebly.com/uploads/1/3/1/6/131606202/wemuxesiwazuwina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ea8d690e-a257-4a1c-95c2-dbebfd474df7/90053030768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adea570c-277b-4d83-a088-260d1ba85d40/the_lottery_summary_short_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ac3511-c312-49a7-9823-8bd2236a9d23/luwumomamitaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790c300a-f6e1-4ae5-9c68-689e0690d7cd/oracle_12c_installation_on_linux_7_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474ea72a-1594-423d-9e96-334b2e476a07/ripufivitasetujiripi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74e792d-21a7-41c7-8ae9-c870147096e9/how_to_say_my_favorite_food_is_pizza_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e32e3d-fee4-43d7-b731-5b09f0807669/gadamer_truth_and_method_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a61693-171a-4444-b7f9-1fd4b93cf226/michigan_straight_medicaid_vision_providers.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5000 bytes
SHA-256: 275393fb159be61ae90dec5cbae6cc7f8c4ea7951feebacabbf2737c8c678eea
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10816 bytes
SHA-256: 808d1c0b959d76fd490700be19d253ddbd3bf3be295153ebc3eab8dc94766599
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3