Malicious PDF — malware analysis report

Static analysis result for SHA-256 1338abc38549cf4d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-25 06:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6729e7e219b8fc9cd215247a38d68061 SHA-1: 9ac881666b6372cec7445991aef7420aa8b22c6b SHA-256: 1338abc38549cf4db065da53382a0befb33ea36b4c2e6b2f196d78e1b6d1870c
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/wix?keyword=impact+of+biotechnology+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/abbjchj/weather_appleton_wi_hourly.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/dc1c773.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/ulibR6S/ates_ve_su_4_tam_ekran.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/ca2fb96d28.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/vesutimu.pdfIn PDF document text
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/rubakenipaxada.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/joxotiv-vutibatelon-toweserekas-zupaxu.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/kulinisokakewi/wetulumalamisokozino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91812a6-776c-4557-9cb1-06bfd9bda119/47691439116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a6cf91-792c-4135-b323-a3eadab06636/tintin_books_ranked.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/leave_of_absence_template_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/fafawu.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_67ffdeba24424a08875ee322b85b5b38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/gujasirorimupenapi.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/free_flyer_background_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/dakowugejatufep.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_77dcf981ed2f456e8d0a38c153ca4da7.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_1181893afc3246a58bf58ee546519af4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee87a77-45b3-4b98-bdb6-cd3faae190f0/retutafewokepavob.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 5764 bytes
SHA-256: 0a247208d371ba9511dc08eaec5356f0b56f37927f83c63f0fefffbfee484677
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10808 bytes
SHA-256: 583e96254afa2d4f3b5bd7637b14964243c11d408841a6614e7ac3b55d364da3

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