Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c630c36ad5f0283…

MALICIOUS

PDF

81.7 KB Created: 2021-04-04 09:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 40af2430f3afc1d3af775fe00417a562 SHA-1: 1037ef76f58fa98eb44f8531c8a60678bf707a83 SHA-256: 1c630c36ad5f0283340861da36c83443cb1e9edbfb7d868dac1ef95b90f4b69d
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 0.9990

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://nipisod.ru/123?utm_term=pais+ausentes+filhos+online+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5fde3f5ebe4cf.pdfIn PDF document text
    • https://lavigumujow.weebly.com/uploads/1/3/4/4/134438710/4412645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601cb30839248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_600bbd21679cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_6026dc2995ace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ffd3f0ca9148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_602301da2c5ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fd39cbf498f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5fe2d8ebe90fc.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/lamakaworowufawi.pdfIn PDF document text
    • https://tumipipap.weebly.com/uploads/1/3/4/5/134598024/firisulukavusomavifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_6053c1bec7173.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/nijaripokoz_fapuwim_lajojesolamapex_galadatidukofi.pdfIn PDF document text
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/03c0ef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421614/normal_5feeba34062be.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/what_is_the_difference_between_touch_free_and_soft_touch.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/callable_bond_valuation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486344/normal_5fcb2b64de3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_602e5ff475083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_60103d5eca170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_6006c06f64e06.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/dad833c0-0c6a-4ecd-9117-b2c92be20262/best_coding_books_for_beginners.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/91658326945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7cc806-d59f-40bf-9d6e-24fd75c7709a/tecnicas_de_redaccion_coherencia_y_concordancia.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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 4916 bytes
SHA-256: 8fc4ea0375e126637c3eb3ffac2286d2d03a51c56b7fb0d10b33e0b9b66c855d
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 13764 bytes
SHA-256: f76833d78693b4cc641094f6b1fbdb52c79d684667557969411379163d9d4ec0
font_02_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c