Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a07269a1d90543c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-13 22:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a444b940cd6a14515ba8edab5acd7444 SHA-1: 5f5286d742f94c51de1fdac77a627670406ed3d0 SHA-256: 5a07269a1d90543cf795a88ede421b3358335e5c9f1438ff30ad27a0840711e8
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 0.9991

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://soxebez.ru/123?utm_term=meteo+campoformido+oggi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387826/normal_6024b62907f21.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/lipadi.pdfIn PDF document text
    • https://sewarekim.weebly.com/uploads/1/3/4/3/134370683/3bb8791483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_5febc925a0da8.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/a9993b935912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488315/normal_6008283d4b00a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5ff35a7252053.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/78142917092.pdfIn PDF document text
    • http://pujejunovidagem.22web.org/19335876825.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/creative_writing_internships_summer_2021.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/webojudexibobubodesu.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/jesus_and_the_disinherited_sparknotes_chapter_3.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/mimosizubefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_6003e7d721820.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_e8a7679d2118400cb9f5b2b5b5f8e020.pdf?index=trueIn PDF document text
    • http://xofivijisaja.rf.gd/97276903163.pdfIn PDF document text
    • http://nekoraxevab.rf.gd/cqc_reports_care_homes.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_0f0aa8d2ea054a00b997844c8017394b.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_bc09ca4c7b5c4ff2b3b3cb2c2453b24b.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_5fb126699e534a9fb19e288b2d383226.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_3e1648a136e24052bbf7d9f54a11c903.pdf?index=trueIn PDF document text
    • http://vofiwevo.epizy.com/fotopoluzonabutoro.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_c674e6306111402bafd6e12e49008641.pdf?index=trueIn PDF document text
    • http://vukenorap.epizy.com/sewage_treatment_plant_commissioning_report.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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 5272 bytes
SHA-256: 3cb2bf72e065548ec8b1477dd6687247b369247ce1605e736eb08ad2ef62637e
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 11808 bytes
SHA-256: 75667b7ef09b8f903229f3617704edcecd8a1c4f402ae74231f738e82b0255aa