Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1888273e911b93…

MALICIOUS

PDF

76.0 KB Created: 2021-04-02 23:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 30caf67e92ae08b5206ffabc051a3db3 SHA-1: b2b11e8d015e24d52a7ad079e6c5196939d7951d SHA-256: 6c1888273e911b93ddc2a7add929d37a6b695be7c6323f27ae7aae2bf9ac2f78
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the structure suggest an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=lagu+agnez+mo+coke+bottle PDF link annotation
    • https://pipenuxoj.weebly.com/uploads/1/3/1/4/131406698/8972931.pdfIn PDF document text
    • https://pisefipekopaz.weebly.com/uploads/1/3/4/4/134461515/nalixux_butebadi.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/hW80ihL/futekeworeridaremibe.pdfIn PDF document text
    • http://sibuvre.com/bivobixeja1hmh.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/aheVehf/zegufosalupu.pdfIn PDF document text
    • http://tuimag.ru/algorithme_de_tri_par_selectionbretw.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/rodejijizu_kixevedukezu_bexabe.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/ieggbji/dekaxitagofe.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/pasibijeladibavumiwi.pdfIn PDF document text
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/43a9cfa.pdfIn PDF document text
    • http://usejus.pro/4827866614o9734.pdfIn PDF document text
    • https://pebogifi.weebly.com/uploads/1/3/1/4/131438694/tebemakito.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/haNn2Do/kivepene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_3d130ef54ce7497b917439a23847abbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94a876b-1534-41d7-b582-fae5df271cbf/53640708200.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d7480b7f8c8444e3ad7acf9c14a73244.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca03dd59-f2b6-4a19-88d6-ce285e0cc3f4/ketamegimuvebebasuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e23932-76a6-40b7-8b38-93cbd7bdc294/6580710340.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_f4b6e16e032843bd93e81e314b40e09c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91dbd21-c431-4ede-8ad6-7d73509b9d15/which_books_are_in_the_catholic_bible.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_e035e5dd20f7475799ec12f93a462543.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43521030-7c9a-46dc-9419-51be8b2dc2be/daratevuvob.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_0f5969bab33d448a9e6a77a9fd229a5b.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 5040 bytes
SHA-256: 87dee2343059579b426a680d15e28d1c487c45b15d591e0bf6c1e8602dbf8420
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 11104 bytes
SHA-256: b8b86c473a22803a3e8645b0603cacd901bedf474545c8672cecea9cf81209ef