Malicious PDF — malware analysis report

Static analysis result for SHA-256 4292eb4c8c9ef590…

MALICIOUS

PDF

74.0 KB Created: 2021-03-20 09:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3fe56b4752769906a367c21c74f5f3a6 SHA-1: 2bb856ca270ed54e3f7cc8e671216f3c2014ab98 SHA-256: 4292eb4c8c9ef590747b54d091760ef0467da7cab9ff5d2a515f649a406b7703
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains, suggesting a link farm or redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=am+pentatonic+all+positions PDF link annotation
    • http://amandeepsadyora.com/kagugasekad482d.pdfIn PDF document text
    • https://laxumobunutag.weebly.com/uploads/1/3/4/0/134017566/0de789a170b7359.pdfIn PDF document text
    • http://heretythere.site/munosexolabhar8.pdfIn PDF document text
    • http://nebo-baikala.ru/49911893301owmjk.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/fourth_universal_definition_of_myocardial_infarction.pdfIn PDF document text
    • http://you-bestshop.xyz/how_to_remove_lint_from_a_whirlpool_cabrio_dryeruzh8o.pdfIn PDF document text
    • http://ogranicbio.fun/walmart_black_friday_2019_65_tv4byux.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/nixozatawanaxig-rudipumik-dojuketa.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/1001_nights_book_price.pdfIn PDF document text
    • http://netewe9.xyz/muxodomulumigonuwuxevg8qbd.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/sevopivebajax.pdfIn PDF document text
    • http://fb-pageunderreview.com/ventajas_y_desventajas_de_los_costos_predeterminados9xwry.pdfIn PDF document text
    • http://hookup154.online/is_anker_a_good_brand_for_earbudsmyv1m.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/rodemipazomitewodori.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/zarixuniwoxa9wvgi.pdfIn PDF document text
    • http://neuroncraft.online/lilorznbf5.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/a29ba73fe0be3e9.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/nelizenejakarug/blazemeter_report_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/gopenaratabiledagux.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/volinosum.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/is_metabank_a_prepaid_account.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/why_is_my_thermostat_display_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/98102744613.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/baseball_uniform_designer_nike.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_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 4972 bytes
SHA-256: 3e0ceeac3574123c36e5a1d1d6cac94fcc293c38f4e0ad450c0fbebc2419c06f
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 9992 bytes
SHA-256: b6b6088708db55d14c699e8e4d8156853656732b7e34c9be0cb8722c20b18841