Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75e8ecb0cb2ecc0…

MALICIOUS

PDF

73.2 KB Created: 2021-03-12 15:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c9523db1a413880b9a8d3d79ce3db96 SHA-1: 5a330950f3885638a58fd701a2529ca1cd7bc6cf SHA-256: f75e8ecb0cb2ecc07bdccf3818aaf59fab987946a9536be9c2cd69b3cbe9d9fc
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=certificate+of+completion+template+pdf PDF link annotation
    • http://rujewazaxijaza.sportsontheweb.net/what_is_the_best_roku_model.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477873/normal_5ff224a81d8c5.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/diguwazowoxopib.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/miller_250_welder_for_sale.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/pononow_talovepadu.pdfIn PDF document text
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/zugotanoveg.pdfIn PDF document text
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/nakoduxinopa.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/edea6e2.pdfIn PDF document text
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/ronuzidurugure_milis_xokubojove_lulagerugazutit.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/2c3caae7a.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/20978379308.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/3a09d38.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/76037957132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_600f4d6d1f3be.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/jasadavebaga/rakafulak.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/58520919322.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/97815129397.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/proform_exercise_bike_bjs.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/kupimus.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/laboratory_experiment_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/how_much_does_private_investigators_earn.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/ibm_spss_amos_24_user_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/23935254487.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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 5028 bytes
SHA-256: 53e09198ec0603f41bc12a335dcd9876faa12e659d50eb0b496a3adf6b16e9f7
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 9960 bytes
SHA-256: 102de48f72393557706b01d16b8001550330be0b7cfb09b6b6ea9ab209ccc292

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