Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59737a8b57a378f…

MALICIOUS

PDF

81.2 KB Created: 2021-05-22 13:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b91c63d2f8c7469b695034534113f75f SHA-1: 9cd7e37e8e1dd158e1ae3a0658b3e55bd4a6c6b0 SHA-256: c59737a8b57a378f06936eb60be7562e3d83f38dc13d93d090b9bcb5932a966e
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=aushadh+darshan+hindi+pdf+free+download PDF link annotation
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/9066150.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/cf528421a8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_5feba094efcde.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/bigenilono-makubi.pdfIn PDF document text
    • https://vevabute.weebly.com/uploads/1/3/4/2/134265428/fesube-vatoregozu.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/mafapelo.pdfIn PDF document text
    • https://xarirutufe.weebly.com/uploads/1/3/4/6/134659575/zegaxebatusubokaw.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/6572223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486213/normal_6008fda13b728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_600cb61148311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_605dad55bb556.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/texube.pdfIn PDF document text
    • https://pugoxadegile.weebly.com/uploads/1/3/1/3/131379866/nakamato_xiwolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_6059ebe00ce6b.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/8733628.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/gunege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bcfff5-49ea-45ea-94ea-f6d5d31bf738/metal_gear_solid_2_sons_of_liberty_vs_substance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb023c76-8ef5-4212-a1a5-96310d86a074/88940422466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e7d73e-690a-4c6f-88a6-4b7025651aec/mujepaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c27650-e5ba-4458-b5be-f8ad055cbd3d/how_to_identify_dogwood_trees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bda2b23-c32a-427f-990f-11110183676c/rufeferufelobumusof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b46821-c7ef-47a5-97f4-46dc14074c8f/safety_first_alpha_select_3_in_1_car_seat_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65498e3c-2b0a-4ce3-b119-6d59b0f6c929/43864970511.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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 5208 bytes
SHA-256: bde8a987a42791b363f91ad39c10e6b4d75e43d794d308974555d96429c29009
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 10832 bytes
SHA-256: 3892c1a8cbfca43721feeab8576caff1e5ef509ae9a0ad0bc7d33e4a8b1f7a7b
font_02_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 4652 bytes
SHA-256: 7d43fd6841dbb110e1a3938b62c3ee0c1fb8a24667cb9e454b12457e2e799ad3