Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51cfb97039590ad…

MALICIOUS

PDF

82.4 KB Created: 2020-12-19 08:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ea0b36eac56b34de26dc32f441916e4e SHA-1: 70cf634fbf768ead6bbdc369ed510d20786b20db SHA-256: f51cfb97039590ad860595c874d67671ce69d49a5b0d02dc2a6351ad2678a368
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to lead users to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=tank+trouble+4+player+unblocked In PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/a2a6067718.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/segifelesilokunuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fcb971ad999a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc6672d915ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade2f0c5-deb1-44dd-b6c1-3b4faa154a95/oracion_dela_magnifica_al_reves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c305613e-7cdf-4dc2-848f-55c4d034a720/einfache_fltenlieder_mit_Noten.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68cfe116eb00e3c7312b3/t/5fcefa260ff3944fc54f7c21/1607399978698/radiologist_assistant_salary_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f1a412-3c46-485a-902f-125038e870b3/tomtom_android_apk_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce04a03775b77c105df4b7/t/5fd6fabbdca2215260579dc2/1607924411780/neuro_physiotherapy_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4286d9-fa18-43db-9874-b38ebe8e155b/gekiviwo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdee7e5d00e108cb36dcd9/t/5fd751f5154d72787109515e/1607946744971/causative_form_upper_intermediate_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f314ab7a-297b-4cad-a95c-8130383204eb/lazefetunupigixani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9416b75d-301a-4289-8225-f1dd77336f5e/jotezovapuk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f19a27a199023ab591db/t/5fc75237b7521d608a43bca9/1606898232664/dwight_howard_lakers_net_worth.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf5a143f7a7c1e6e8b9c73/t/5fd634425b1f6f7539d11b4b/1607873609942/secura_burr_grinder_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 10104 bytes
SHA-256: 39edbafe28832a4aa8ad3d6d86ccfc7e816208ad87d257ae35d7962c00135a53
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 5232 bytes
SHA-256: bd21958acf79614c258b70edfa9f5bc51599893df6ee4dc217afadf725aa5697
font_02_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 12492 bytes
SHA-256: 5c56df4ac28d4134b603c0f887896c779477bb98137d277dfe7e6e158668ef9b
font_03_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16308 bytes
SHA-256: 6a609b97ebaf6264621251d52840f89382ebb5cc4e2164f954d00180ea3651e0

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