Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cef6a852d2a015a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 09:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 068c4a2e4efa21f190264732764cb8c9 SHA-1: 30a6e0dc88c96bfb89c2af6571437a939742d417 SHA-256: 8cef6a852d2a015a474088ffeb45bd291ec0119add9d28ca7858b1563cdf64bd
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external links, including one to 'resalured.ru', suggesting an attempt to redirect users to potentially malicious or phishing websites. The document body, though heavily obfuscated, appears to be a lure related to 'mythological creatures'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://resalured.ru/123?utm_term=mythological+creatures+94+answers PDF link annotation
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/65c46f1cf6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_604681c9b3a1c.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/sony_cyber_shot_dsc_hx300_charger.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/sarutu_jexifotolim_marom_redorafutadopu.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/fundamentals_of_astrodynamics_roger_r_bate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fe01424d4415.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/cadena_de_favores_resumen.pdfIn PDF document text
    • https://soranetibipuve.weebly.com/uploads/1/3/0/7/130738631/numowegagezera.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/77133236737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fee66df550a0.pdfIn PDF document text
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/kuziw.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/hdfc_mutual_fund_sip_stop_form.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/alcatel_a206g_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_09df50919fd64ddfb6de2d252d320e5d.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_cf6371495fc14196858f6f48d1de1369.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_8e3e25db37d3426db80363044e82d742.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_695634c187e74623a293104faff874a6.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_1dafc2387b814d4ebff28b498df27e1c.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_470566a62d1945fdb24b22d20e6fa5c6.pdf?index=trueIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_46d9925eff1643d18808781ca36a327b.pdf?index=trueIn PDF document text
    • http://zerowegujij.onlinewebshop.net/2574771383.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_782b80e6945d4715aa2acdfbed587bd6.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_e1f06658ea634d8e8eab2ce296ff45cd.pdf?index=trueIn PDF document text
    • http://rivenoke.onlinewebshop.net/acca_f9_study_text_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 5504 bytes
SHA-256: e6826654b14435bf4cb8c715160641b95d802637a093ffbf4a2ba71fefda5bdc
font_01_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10556 bytes
SHA-256: 633a4a9ea0bd70d47138713a632b4de44c3783e95d576f9c094465b20ccde99e
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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