Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfc18bc876a9bb2…

MALICIOUS

PDF

76.7 KB Created: 2021-04-15 10:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c8b61654ecb09f9d8ede24b401a07725 SHA-1: 813c3dad329a7088ecb2909fe967bf59effefb96 SHA-256: 6cfc18bc876a9bb2b3c555e826487f207c49c2c4cc033e500cde64602cc58bd4
230 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious redirector and part of a link farm, with a high ML classifier score and ClamAV detection. The document body, though partially corrupted, contains text suggesting a download lure. The embedded URLs point to known malicious infrastructure, likely serving as a phishing or malware distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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
  • 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://yafferge.ru/strik?utm_term=how+do+i+know+the+author%2527s+point+of+view In PDF document text
    • http://es50off.pro/mewuso2wlml.pdfIn PDF document text
    • http://vehicleusains.com/45656091130xcq53.pdfIn PDF document text
    • http://goods-amzon.com/78526013599455sz.pdfIn PDF document text
    • http://monongzhlh.space/cooking_terms_worksheet_page_34uxekp.pdfIn PDF document text
    • http://bagedejatobino.22web.org/pasar_de_a_word_gratis_y_rapido_en_linea.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/voropa/lejinuzexupi.pdfIn PDF document text
    • http://rexenejo.epizy.com/12322457210.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_31d37baa49f34e4ab2d0d253df9a7a86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/maa_chandraghanta_images.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/lanumovuxanosilezagofo.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_a4f6cb218fc94f4b975c345b59746992.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/the_chaser_full_movie_in_tamil.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_76643812b56242bfab1953b7e1cca4ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/ecology_unit_vocabulary_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/95843609250.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/zodoni.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/figabezopuzupenujalovo.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/how_to_start_a_letter_of_recommendation_for_an_award.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/payment_receipt_format_word.pdfIn PDF document text
    • http://ruvedinaz.rf.gd/beavers_uniform_badge_location.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/administrao_estratgica_barney.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_1dc94ae440124938913572e457b0a4cf.pdf?index=trueIn 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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 5308 bytes
SHA-256: 6381aa89906a5390c806e38eb02445bebb2f9b37156290e0e4549508f0a98f46
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 10764 bytes
SHA-256: 85404fd6ab08de065d29e29eaecaab5c3817872d6fb82b0e3572c39866674e1e

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