Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f167f5b5e6de84c…

MALICIOUS

PDF

76.2 KB Created: 2021-05-19 23:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad518b2debe412e006f484cf565c1e77 SHA-1: 15ee092fd0ab8f74f29091f4648416bdd870e261 SHA-256: 7f167f5b5e6de84c3222b055fc58070b3c2dbafa44e40f7597c4592aa7e3baa2
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'medical prescription' which aligns with the external URL's query parameter, indicating a lure.

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://midufefew.ru/strik?utm_term=how+to+write+a+medical+prescription PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413966/normal_60245075dadd3.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/1621699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff94a16d4f8b.pdfIn PDF document text
    • https://nidewusojob.weebly.com/uploads/1/3/1/4/131438556/kuzugubavegep.pdfIn PDF document text
    • https://zufojemesegogof.weebly.com/uploads/1/3/4/7/134753559/pupegalosepewezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcbec4eed126.pdfIn PDF document text
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/jogemite-gulejuwanaluna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_600c651522958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5b01c2-bbbf-404b-9992-661fd3ad1363/36522710638.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/7262918322.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/woman_warrior_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613bd481-fc6f-43e5-b3f7-d203fc815af4/dovunitimurubetogukufewa.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/how_to_report_a_soldier_for_misconduct.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/56697859033.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/amvic_inspection_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6f5391-0f5d-424f-92a3-478987b9d27a/bidurelad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c021d5-2f2a-417b-a906-15dd2c7b9886/principles_of_design_balance_and_alignment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1301dd1e-7ddf-41b0-b1f9-64e85a06ceaa/garmin_vivofit_jr_2_star_wars_first_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcecaa20-fc34-4e0f-8325-55c0319c99b3/rijevewotivapexab.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5272 bytes
SHA-256: 8b23b788524a4c2502b88ba70d79afece373d443e9c937b14cf77a51409f4cdd
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 11388 bytes
SHA-256: ba5592aeaa264960f1d1e75174627b4be6b2c1b0f64b4ebb52384d24f1ccff83

Open this report in the interactive analyzer, or submit your own file for analysis.