Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72089ebba988d28…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 06:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d2c0918d5b3839419e49a98cfd68f30a SHA-1: 429ae25a84566bce15217f240f8ee3186b5f788e SHA-256: f72089ebba988d2833b6d2c30f9dcc202ca172acc3d846fa336257b879710be2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a site offering 'college algebra problems with solutions and answers pdf'. This suggests a lure to a potentially malicious website. The ClamAV detection and ML classifier indicate a high probability of malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=college+algebra+problems+with+solutions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406223/normal_6005a234d2546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5ff1869747413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fedf39a4b21d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_587cf44f865048c6b596c60c237e6844.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9bcdde-d34e-4d4d-b935-634c7f630d3e/when_the_grizzlies_walked_upright.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_06fbad068aa94646bd266b9337d87e7e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/rafatopikumodefadat.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/sunova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4010693c-3740-4e4d-97a6-411d46cfdfe5/zotetajavunikefi.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/72381797929.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/2004_g35_manual_transmission_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/bagovasusuzila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b152dc-5339-4bb3-9ad9-af3472b04717/ximeraganolezolaradawe.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/scientific_notation_addition_and_subtraction_matching_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326090af-1e93-4e84-8698-f7072485dd9a/43838936219.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/16255065146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99ccae2-547d-4050-8ae4-078f6182ba84/how_to_make_a_hyperbaric_oxygen_chamber.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/pivudedeweronop.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/convert_google_books_to.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_7c9bfcdb7f774d88b99270df37493ec0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/8311634768.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/phn_mm_audio_recorder_platinum.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_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 5592 bytes
SHA-256: e8b586b2cc78687c4e0e45dfc22b3c909db848f7e9ec175f070111ddaa526a6a
font_01_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 11860 bytes
SHA-256: 094ce9a4a20c85671f0f57c8a2820e2ab5ac65d406540c8d6fd314495175620b

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