Malicious PDF — malware analysis report

Static analysis result for SHA-256 678abbccc7e196b7…

MALICIOUS

PDF

75.1 KB Created: 2021-05-01 13:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23accb83dcac5684a622ef84b069bede SHA-1: c929da3114124a1e0bd08ab08783df05e6b4891a SHA-256: 678abbccc7e196b793d28eb20e27be2cc745ee73169cb513971db0290a2fa44d
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary redirector URL is https://xezojetit.ru/strik, which is used in conjunction with search terms like 'honeywell hyperion 1300g quick start guide' to appear as a legitimate download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=honeywell+hyperion+1300g+quick+start+guide PDF link annotation
    • http://vojidovalo.iblogger.org/how_to_graphic_design_a_book_cover.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/rotudibozoxoki_beposalapirepig_tasojid.pdfIn PDF document text
    • http://mizagoride.iblogger.org/duniwagugabajasojetosur.pdfIn PDF document text
    • http://jokidinavefo.22web.org/34037179607.pdfIn PDF document text
    • http://duboxol.iblogger.org/ritarobabi.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/blue_bells_of_scotland_trombone.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/vijevuditi.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/wupuxus/paloma_tankless_water_heater_error_code_14.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/transformare_metri_patrati_in_cm_patrati.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/charitable_trust_registration_form.pdfIn PDF document text
    • http://xinonot.epizy.com/alcohol_y_depresion.pdfIn PDF document text
    • http://gepopimasirepav.rf.gd/coolpix_p510_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/vcruntime140._dll_free_64_bit_windows_7.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/guvojotokujedafa.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/17065144654.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/ap_biology_exam_study_guide.pdfIn PDF document text
    • http://gejaxogepokotow.rf.gd/50857361599.pdfIn PDF document text
    • http://vegizutix.rf.gd/71269912958.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/leblanc_guide_probuilds.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/lozokovuminane.pdfIn PDF document text
    • http://fizebozemugi.epizy.com/73363931947.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/lake_lewisville_crappie_fishing_report.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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 6040 bytes
SHA-256: 8cefac7b09a4213fbd32a75c2acd8439491ad30267cd2d2d1f05c1997345b1a3
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 11084 bytes
SHA-256: 1b4b4024cc9f7f9e3172d29b80b2dffb85585214f61bd9dce3e9d323af328a2a

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