Malicious PDF — malware analysis report

Static analysis result for SHA-256 865c2eefda50ad14…

MALICIOUS

PDF

89.9 KB Created: 2021-04-04 07:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 511257b76f58e505147075cc64bb7bba SHA-1: 6c77c26714bdeb645a3746b75734e0228ae9ddd6 SHA-256: 865c2eefda50ad14d23fd8187b258241beb9446e9fd9df3f1dee6f6d7f46de30
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a malicious intent to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=spread+spectrum+techniques+pdf PDF link annotation
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/jinopas_tifososafufa_zagovogexidat_karetum.pdfIn PDF document text
    • https://bokenupipanedi.weebly.com/uploads/1/3/1/4/131483400/4088802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458839/normal_601fd2e5ae7b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_605f991373221.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481068/normal_5fc74a2e5a28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5fec73680e.pdfIn PDF document text
    • https://ximuvibimujobu.weebly.com/uploads/1/3/2/6/132695583/4556878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_6027e7cfcc5e8.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/1529198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fe4fed4f3d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6042230173e46.pdfIn PDF document text
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/lowoferilabiveniw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fefa203f3ba8.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/bulikowexunepov/dividing_integers_worksheet_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/51999248156.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_a6f64c8100be412ea49bd90dd0402c97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/louver_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10900d84-6a80-4ed7-9c4a-85de0b05f7e4/3250409009.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_cbe10bc0bd2247c3a682f46b100b35b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea72d37e-b740-4724-b62e-6294f83971b2/7131972744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0b665f-6834-4366-af07-808d6fecbeed/zexevokot.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/nukomukibimodamoxojopoxov.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/17530025608.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_a89389da656c49b4955457207a21cfde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81761a2f-4eec-4e8c-999e-ea1d4428e828/finding_missing_angles_in_triangles_and_quadrilaterals_worksheet_tes.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_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 5592 bytes
SHA-256: 5728f7d808fafb7a3cbdba56818938edb2880b3bdcb21d4855909b4cee6b81a6
font_01_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 11064 bytes
SHA-256: d9dac0bbde0cf4122dcb75a3ef07c610530745f6d1d85ebba3ee8faadf61b187