Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ddce9d6317eef5…

MALICIOUS

PDF

70.7 KB Created: 2021-02-24 02:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7d1f0896f34f3a17cfd912ce904618c0 SHA-1: 7946cf1ac73cdad16444dba57349cb9ba52104c0 SHA-256: 24ddce9d6317eef5223439a46e7ce0bcf951eb884248678dc04f08908f71abe5
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, characteristic of a link farm or SEO spam. While the document body suggests a topic about greenhouse irrigation, the primary function appears to be directing users to a network of external PDF resources. No scripts were extracted, but the presence of numerous external URIs suggests a potential for further malicious activity or information gathering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://leonvi.ru/123?utm_term=how+to+set+up+a+greenhouse+irrigation+system PDF link annotation
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/vuxanomafalujat.pdfIn PDF document text
    • http://govazibibili.22web.org/76567277215.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/zovovizaluj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_602e7388727f2.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/19876532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/aptamer_review.pdfIn PDF document text
    • http://dovobol.epizy.com/84118435868.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/76905617569.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/75821693626.pdfIn PDF document text
    • http://dokubuxopid.rf.gd/pepakagobiwemiruxezozuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/automotive_service_checklist.pdfIn PDF document text
    • http://sopixixu.epizy.com/age_age_dehiya_tutata.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/son_chiraiya_full_hd_movie.pdfIn PDF document text
    • http://vadudax.epizy.com/56709366857.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/ch3chch3ch3_boiling_point.pdfIn PDF document text
    • http://merojupamen.epizy.com/imagenomic_portraiture_setup.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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 5356 bytes
SHA-256: 8236d16cedf2f8b04e15aeb2739aefc07ae421c104f0ece6b9da724fec9c285d
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10448 bytes
SHA-256: 96f857f6fba48ef88260795d2836120e9b35a7f8bcc17fe9ed3a5c896b3fc399

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