Malicious PDF — malware analysis report

Static analysis result for SHA-256 80db918344ba124f…

MALICIOUS

PDF

77.1 KB Created: 2021-05-14 15:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b6d057febf575177fb001ff97fc51863 SHA-1: d3624d17008a09419364bd18cd5efab4e419bdcd SHA-256: 80db918344ba124f1fcb0115b235fc541a0534485adcab27c60518c1317eeadc
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous external links, many of which are hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure for a 'Dr. Seuss sleep book pdf free download', which is a common tactic for phishing or malware distribution. The presence of external URIs and a link farm indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • 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://midufefew.ru/strik?utm_term=dr.+seuss+sleep+book+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/dukapudubi/kidhhxo/gavolerukosunukavinivijot.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/fac0fa986.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/acea43.pdfIn PDF document text
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/6691612.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/e7109f.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/iegzNia/gawokomijo.pdfIn PDF document text
    • http://kuvobutigok.iblogger.org/uppercase_letter_tracing_worksheets.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/3492214.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/boxalewijim/compound_adjectives_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22f67f5-3366-4c21-8d02-e27f229ea261/como_crear_una_hoja_de_vida_en_computrabajo.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/xematesazixinoxeso.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_6c705ee1236f43b2bf75769148fdc9ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f600ce-d21e-4508-b90e-76661b839abc/77247343565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712174c9-e088-471f-9680-8ceb40c09c84/game_of_thrones_books_vs_show_which_is_better_reddit.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/administracion_hotelera_y_turismo.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/love_simon_book_series_order.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/zemuxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db9d89f-5804-4e1f-a4ca-746aa12213fd/royal_caribbean_deluxe_beverage_package_2019.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_5725f38ec67140acae17ee2d80cf0ea9.pdf?index=trueIn PDF document text
    • http://xigofopaxedu.rf.gd/90816501853.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_358c3e75077a4ae7ae3b82136fe94066.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_a3ce8438a6144f65ba7df6a76c0e669b.pdf?index=trueIn 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_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 5360 bytes
SHA-256: f9a303b426f90da968682fd99eb65fc21d62a5026f85a1cdf27d24bd6cc75e15
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10664 bytes
SHA-256: 3bea353acd4e94175cf927265818fbf1591938a4abf743feea96be2b39ea8aa4