Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea701aa3e5557518…

MALICIOUS

PDF

67.6 KB Created: 2021-02-13 22:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0565e709b1ec524574730161a34c164e SHA-1: 425530c61e31cc9c28d2af49969aaade1f71d972 SHA-256: ea701aa3e5557518523c6606b1c2447bf764a060f2a6fe5740454a1772650bff
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a lure for 'group 4 exam answer key 2019 bbb'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for such lures. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or to serve a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

Heuristics 4

  • 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 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
  • 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/aws?utm_term=group+4+exam+answer+key+2019+bbb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462096/normal_600b0ecef02ee.pdfIn PDF document text
    • http://uchebnoe.website/maria_s_decision_making_grid_answers7rdc6.pdfIn PDF document text
    • http://faketikus.22web.org/assassination_of_franz_ferdinand_worksheet.pdfIn PDF document text
    • http://mxbur.fun/66005308548fiwjy.pdfIn PDF document text
    • http://fusavexupisedi.iblogger.org/tupejudipexawisewuzikaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5feb2b6e020c3.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/431e460.pdfIn PDF document text
    • http://monongzhlh.space/karvy_mf_common_transaction_form8pdmw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_6019ad7348c9d.pdfIn PDF document text
    • http://pubguckazan.com/graft_versus_host_disease_treatment_guidelines4su85.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/niporofez/14258018555.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/95523680325.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/camera_effects_platform.pdfIn PDF document text
    • http://povusesa.rf.gd/2012_chevy_cruze_manual_transmission_fluid.pdfIn PDF document text
    • http://beroseji.epizy.com/mariam_khan_reporting_live_serial.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 6000 bytes
SHA-256: 697039c732bce1c545879947a606b620d6d763bc1c09b4c46713d171d53a7dc1

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