Malicious PDF — malware analysis report

Static analysis result for SHA-256 7870087ab2b017e6…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 08:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e6d05e573e74aacc4a011f5ab344327 SHA-1: 76d320eb3b1ba52010b24bf2543c83a6ad1fa9c1 SHA-256: 7870087ab2b017e614bfc865d796862e8909a50f23c4c69b015408539214841e
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying a link farm and an SEO redirector disguised as a lure for 'unblocked games'. The embedded URLs suggest an attempt to direct users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://midufefew.ru/wix?keyword=unblocked+games+687 PDF link annotation
    • http://lowabunuzoxa.getenjoyment.net/misemines.pdfIn PDF document text
    • http://caterm.ru/47447925818w4yaf.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/iiggjiu/penisepetasigubadujafiju.pdfIn PDF document text
    • https://wiwunofubej.weebly.com/uploads/1/3/4/0/134012322/zatijobelurogap.pdfIn PDF document text
    • http://soldonlakewood.com/jomuzomubasuluq5595.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jjfgeZk/best_online_deals_right_now_clothes.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/waxedavulakew-nekonuno.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/business_case_espaol.pdfIn PDF document text
    • https://firulasimasib.weebly.com/uploads/1/3/0/9/130969438/8200514.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/hdgh68C/79118870673.pdfIn PDF document text
    • http://universal-kirov.ru/2019_audi_r8_performance_0-_607kjyg.pdfIn PDF document text
    • http://kellys.space/21848679803mnbta.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/6b446e2cf3614.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/iiagiii/acids_and_alkalis_revision_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/american_dream_in_death_of_a_salesman_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/cibil_report_login_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/autoclaved_aerated_concrete.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/apiculture_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/how_to_assemble_a_total_gym_platinum.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/87335578463.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/kovizozixibumobojamilij.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/vimebutefeju.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/82234194351.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/how_long_will_a_2011_chevy_traverse_last.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/86700595976.pdfIn PDF document text
    • http://dopovis.myartsonline.com/wudoda.pdfIn PDF document text
    • http://ruvemad.myartsonline.com/kalabewomoxeko.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5788 bytes
SHA-256: 9f8a606a15d0c39a648021b8fc146bfa21f848dc4d236c2eb26131907f607cd2
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 10468 bytes
SHA-256: f5a2da3c72fb7e7b54048f17a1ceea14f891ee27077b746f4145932f9795e093