Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebc34248502e9a2…

MALICIOUS

PDF

68.7 KB Created: 2021-03-22 17:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 861b3c6b93709bccd3114facde48b27f SHA-1: 033cefa3c2482743ebe37936c0595a530f1dbe84 SHA-256: bebc34248502e9a2ddd3f0837b119a55140d2122c1a0c3d6b52887f20bd68d7b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use in a campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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
  • 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://jottigo.ru/wix?keyword=qiagen+miniprep+protocol+rna PDF link annotation
    • https://cdn.sqhk.co/xotosira/Kjgyhgd/playhouse_lounge_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/ha705id/cyber_hunter_lite_apk_download_for_pc.pdfIn PDF document text
    • http://teren.fun/114446623783kfmq.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/13926066972.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/takosidanolumudubule.pdfIn PDF document text
    • https://rafanubenab.weebly.com/uploads/1/3/4/7/134747024/fefizu_kubaxogazor_luwoner.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/ahaNRib/digixefijufana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_60274cef77e51.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/ganogaginawafo_ruxedabag_zaxetupegidite.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/wmJgj9A/molecular_genetics_and_metabolism_reports_impact.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fff2e5568a2e.pdfIn PDF document text
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/filexu.pdfIn PDF document text
    • http://gooddevice-online.com/peets_ucsd_hours04tg6.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/tumaletuj.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://new-leggins.site/73593779528os9gr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarutufasiko.atwebpages.com/xilojesuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e94981-8a3b-4938-9454-1d037a6c106b/french_er_verb_endings_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03c9d11-5f42-4d2d-b597-887503c028e7/gikavomijup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e998698-d696-4855-894a-7760a923e214/ecg_for_dummies_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f205f3-0dd7-4d45-9c3e-f67a314155bd/food_web_worksheet_6th_grade.pdfIn PDF document text
    • http://wiwosotu.myartsonline.com/monopoly_rules_buying_houses_in_jail.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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 5136 bytes
SHA-256: b1a0909ac97ef97671af59f5a9d6cc311a00d5c6ca433bbbfe574072fc41e5bb
font_01_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 9912 bytes
SHA-256: 8f069de08bc225bc00951363d0fd78f5d64bd2f68e5c072c9e75e69f0c542bfe

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