Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7692deac4f3c8b9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 21:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3199f1369520e5e3c7d845645347568a SHA-1: 6944196022cf4009ccb6b547fddefcd4019a224f SHA-256: a7692deac4f3c8b9cc223f3010d48ef0c8f2c22e432b05792f179f19c70c2125
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using a "brain training programs" theme to entice users. It redirects to an external URL, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall pattern points to a phishing attack delivered as an attachment.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=do+brain+training+programs+work+pdf PDF link annotation
    • http://puxeguka.iblogger.org/samsung_galaxy_s10_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_6052f839c10ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_602a8e83cb3ff.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/vipuxafol/future_progressive_tense_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/separador_de_small.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/gulepipi.pdfIn PDF document text
    • http://rifezovepon.rf.gd/logo_quiz_answers_level_31_iphone.pdfIn PDF document text
    • http://jewawemerawu.rf.gd/94527207378.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/pavanunudip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c76e4f-47f1-4d5a-9e58-4801ca4c20ac/cuisinart_14_cup_coffee_maker_with_thermal_carafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1552dd3b-1dcc-46de-83d4-4c7dd1237ffa/kejajowidas.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/mechanical_commissioning_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/89504914558.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/google_analytics_certification_questions_and_answers.pdfIn PDF document text
    • http://webubekesivamuf.epizy.com/80337182684.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/what_are_the_monsters_in_scary_stories_to_tell_in_the_dark.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/77295236240.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/instagram_post_template_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/bastards_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/fatufumezera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6baaf3bc-f5ff-4062-ad70-6a9a3b8faf26/61477965135.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/53358526762.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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 5624 bytes
SHA-256: e99dbb8b08029146fea3635ae3ede1e0ef883827da08a42c773b46c67e49f0f4
font_01_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 10656 bytes
SHA-256: d179115b21badd5b9d7c9fc67a7b3ad2725f4d7e29600b079964b4405eba4442

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