Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc70dbfe20a89b19…

MALICIOUS

PDF

73.7 KB Created: 2021-03-17 13:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5077223fc6fba303e6febc6487476570 SHA-1: c59066f709da38018ba314658f625beafcd066c5 SHA-256: dc70dbfe20a89b19daadb639bb0e67c04f5d66fb3250682608c8682a74c41d7a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • 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://xajibur.ru/award?keyword=catalogue+philips+2020+pdf PDF link annotation
    • https://foxetevuleludo.weebly.com/uploads/1/3/4/8/134859937/2237bbb2cc.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/1UjeusK/megalodon_shark_teeth.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/c5Ihhcl/followership_and_leadership.pdfIn PDF document text
    • http://peskomment.ru/what_are_three_kinds_of_texturesuh3yp.pdfIn PDF document text
    • http://erogan-columbia.site/best_book_on_art_of_seductiontn92h.pdfIn PDF document text
    • https://latopekezap.weebly.com/uploads/1/3/1/4/131437375/0289cf0a18dea7.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/VGha7ja/world_cup_ball_2014_orange.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/gEsV5hh/alone_images_with_quotes_in_tamil.pdfIn PDF document text
    • http://evatopshop.xyz/plants_vs_zombies_1_paid_apkdkusy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_0dba1a7861004f8d80749f09acc3ed0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/123a23a5-a7d9-4c4c-8148-50f7fdbd7833/how_to_make_coffee_in_a_hamilton_beach_commercial_coffee_maker.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_c01ba0cb24e14c358fb19d1ec6cd91ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/776d48c3-ee69-4540-b3bb-490a941bccd4/ncees_fe_exam_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1febc103-2866-4043-93a6-018fef5040e5/50293514581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998889ec-0724-4f19-b09a-fe3d843c09f4/87666787825.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 5384 bytes
SHA-256: a19032612e2b5e675464f3237914883a80d92d1071db239f0793245bb39be2db
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 11212 bytes
SHA-256: c2fa2a0d2a56974f3ad28977b1d5a8bd98e1a5f30741252ce2e23bc6102dfb78

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