Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5969875acd24f40…

MALICIOUS

PDF

69.3 KB Created: 2021-04-04 04:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dd689659f194bac1144169829d86c6c6 SHA-1: 99471a7af4c05799fa35dd8f75210c99b77fa755 SHA-256: a5969875acd24f40276aa3a0546267ffcb9a88c8bc6a9ef5afe9ddf2df322d5c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various domains, some of which are disposable. This suggests an attempt to distribute malicious content or phish users through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cinta+luar+biasa+cover++mp4 PDF link annotation
    • http://favodokoleti.mypressonline.com/astral_projection_beginners_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zenokosix/jy4hiuE/vebotaseru.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/vabovopedivofuzovawola.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/abdominal_exercises.pdfIn PDF document text
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/kabito_ligoruban.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/ropokaxuzikifi.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/jirojafedogijulatonigev.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/7hhsjep/donafiburi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_d023ee0a0c1b4c34ba9b0279c308c057.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_ad6897da7f0b491b8a5c35441d321dbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/director_de_alimentos_y_bebidas_definicion.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_85fd60a246a4492dac9aab6a1690beef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/plataforma_riesgos_psicosociales_achs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9fa624-bef4-4e82-a578-d2b46ba4469f/tomibev.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_b79f4250d2114f06b6fba0853587f6fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ef3b5f-990c-4466-af8d-ca2542bd517a/dd_2nd_edition_spells.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/jafosazus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25f4ee2-1f59-4002-9a92-acc0e8352885/goxilubitakoreranumixiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/lord_of_the_rings_trilogy_blu_ray_extended_edition_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 5272 bytes
SHA-256: c085c1c6e2de8afd4f842b9d0a96c151c4ba7e477e9828bec285deca5689248f
font_01_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 10564 bytes
SHA-256: eb58f51e747cecf791caf11ad0d74af5be52aa34d2005d1ae9b17cd2dac6b7f3

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