Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fb55ef0dab0e2b…

MALICIOUS

PDF

100.4 KB Created: 2021-05-30 23:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4116d62358773fe155f0f18635fd8a7b SHA-1: 0b3746d059d52786c41505a784e22bae784e61f0 SHA-256: 32fb55ef0dab0e2b097e228cfb58f9cd2c64d75888a2d95a5fb00f27175fdff9
244 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+little+prince+antoine+de+saint+exupery+summary In PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/7a280.pdfIn PDF document text
    • https://turumokapitaka.weebly.com/uploads/1/3/4/6/134613572/2174954.pdfIn PDF document text
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/04aacb6b36.pdfIn PDF document text
    • https://xafuraworeduvux.weebly.com/uploads/1/3/4/7/134752052/3767778.pdfIn PDF document text
    • https://figunetu.weebly.com/uploads/1/3/4/3/134353482/4326565.pdfIn PDF document text
    • https://duvutonog.weebly.com/uploads/1/3/6/0/136020002/f55cf1b1aac89.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/7388050.pdfIn PDF document text
    • https://vusuneroroloxik.weebly.com/uploads/1/3/4/0/134096702/nugabajaguj.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/fujiwusixezufes.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/9950577.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/bbff265c-bf16-4aa1-bee1-31ac0bb7896c/pajiloxavero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d424af1b-40d1-4889-b31b-b158c8c138e4/maths_textbook_class_7_scert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fe3d46-56c9-4bc5-b219-08825f703d33/96492781772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1a4103-7937-4733-aa29-142f4abe3ab2/black_and_decker_circular_saw_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f99d55-a8f3-47ae-9c5d-a2878ac5ce0e/ignite_spri_premium_pull_up_bar_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c63c7a2-9ce5-42ea-af42-2f33ae661a6a/how_to_draw_anime_bodies_female.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9111f519-2942-41db-9eff-a168f4f80632/venezuela_forma_de_gobierno_yahoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2f7a26-5de7-4abf-a0ac-03cb29df3560/63679413715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de12fe9b-ab51-4048-a651-87abeedc0982/platicas_de_bautizo_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7ee710-ce12-4de2-8e19-53ceda0bb6ef/necchi_sewing_machine_model_3537_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08cd3b9-7dd6-4a12-a598-5255b281e28a/15472323890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a265e9d-771f-4b4a-a020-d0023c15f80c/87440631236.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_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 5316 bytes
SHA-256: d998161d7dda42fa53238378f470534a5d3b01248b734196455bf4c17c18de4e
font_01_sfnt_off00014efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFE 10844 bytes
SHA-256: 10f3001d4a345d7afd48fbb74006c2af81bd23d7a35446ac3dcf7ca1181f4544
font_02_sfnt_off000173ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173ED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333