Malicious PDF — malware analysis report

Static analysis result for SHA-256 2519abc2c892048b…

MALICIOUS

PDF

89.9 KB Created: 2021-04-28 22:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f621f65ed24369cdc0e6982b5515fc38 SHA-1: 70900893ddfa9d497414ad5c2943401020fd9af3 SHA-256: 2519abc2c892048b130e2a98df1113ad9a161dc500900b7443663c2f28ab9d2b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://xajibur.ru/strik?utm_term=forma+de+comunicacion+actual', is flagged as suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'Forma de comunicacion actual' (Current communication form). While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest potential for embedded malicious JavaScript or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=forma+de+comunicacion+actual PDF link annotation
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/7c93d8f.pdfIn PDF document text
    • http://texewofe.22web.org/xilurujisidobowozegab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_6068e61baec5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_603774c1a19e2.pdfIn PDF document text
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/bixalexerakami-duwis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467300/normal_5ff2c12a8d13b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f5ef9e938.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/chuyn_t_file_nh_sang.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/punazenekelipu_guxup.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/bokexizometun/pitosobofumid.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/manualidades_con_carton_de_huevo_para_navidad.pdfIn PDF document text
    • http://livivisobozi.rf.gd/85845678226.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/temimasitexizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822ecf8a-0e17-4cea-b81d-69b2ce11d103/63211729073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0a1c9f-20b3-4a9a-920d-cf60f7d6a404/52141336512.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/how_much_does_a_jeep_renegade_service_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/what_is_a_good_sats_score_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/70495990115.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_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 4864 bytes
SHA-256: 7e6a5ff8a01790fc84a7bd16455b34cab4e68b333aab91967769ec850720e785
font_01_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 12908 bytes
SHA-256: fc0a9c51c5fa04b4a619352528e4eb63e67edb00bf1fbba20e4a989ad1026830

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