Malicious PDF — malware analysis report

Static analysis result for SHA-256 2443f847d19742b5…

MALICIOUS

PDF

84.9 KB Created: 2021-01-21 09:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6b6fe14815398ac0d4c958615ce8a8c7 SHA-1: e8913ccf541e3e4188ae060f4c6c8fd63d2c3738 SHA-256: 2443f847d19742b5cf847f3e39224cba99754bf73684bfe12151da38aaa19fbb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/123?utm_term=la+subasta+de+un+alma+drama+cristiano'. The ML classifier and ClamAV also flagged this PDF as malicious. The presence of a link farm suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ggtraff.ru/123?utm_term=la+subasta+de+un+alma+drama+cristiano In PDF document text
    • https://perufagumitaxa.weebly.com/uploads/1/3/0/7/130738779/5195441.pdfIn PDF document text
    • https://site-1175554.mozfiles.com/files/1175554/jidufuwepogu.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/6197414.pdfIn PDF document text
    • https://site-1185312.mozfiles.com/files/1185312/13126337196.pdfIn PDF document text
    • https://site-1172793.mozfiles.com/files/1172793/42770762422.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/8028572.pdfIn PDF document text
    • https://site-1205776.mozfiles.com/files/1205776/adobe_photoshop_7__0_filter_file_free.pdfIn PDF document text
    • https://site-1180826.mozfiles.com/files/1180826/50027575092.pdfIn PDF document text
    • https://site-1210550.mozfiles.com/files/1210550/2_dof_helicopter_model.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/russian_cars_simulator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojederetesez.epizy.com/saregezemiwekapija.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/kogoboxapibutedek.pdfIn PDF document text
    • http://gefuxexo.epizy.com/94408888640.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/pupuzitav.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/3d_offline_games_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/88101749020.pdfIn PDF document text
    • http://firuneta.rf.gd/60161694699.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/vedusafodosobefa.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/crappie_fishing_report_lake_oconee.pdfIn PDF document text
    • http://jomedive.epizy.com/43124019088.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/26015456567.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_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 5168 bytes
SHA-256: dfd0625327e133460c3a297587622d50701dda5950cbad9de14924ca701ac32e
font_01_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 11508 bytes
SHA-256: 3a3b0f292ebc953a352309006953c737dfefe0c12c94aba267a1d536691c3157

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