Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b683e0b28773946…

MALICIOUS

PDF

79.0 KB Created: 2021-03-20 05:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ab3f9f0514420f8cadbda28b39a7ec36 SHA-1: 4691afa0d03dedb85a84929709407106ea210f7b SHA-256: 8b683e0b28773946ab48ab3d705317271d7612e153946e060676123b758c9dae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam tactic. The primary URL, https://botokaw.ru/strik, is likely a malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, possibly involving JavaScript execution to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://botokaw.ru/strik?utm_term=110cc+engine+oil+cooler+size+calculator PDF link annotation
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/tixat.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/gerunawevuk.pdfIn PDF document text
    • http://theraisins.pro/huckleberry_finn_chapter_21_summary_shmoopcj5wa.pdfIn PDF document text
    • http://silkhfig.bid/tn_school_teachers_attendance_appv0ecv.pdfIn PDF document text
    • https://rititebavoxufi.weebly.com/uploads/1/3/4/7/134705535/zopuvukekel.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/hiAKhcL/90019197254.pdfIn PDF document text
    • https://sozuxope.weebly.com/uploads/1/3/4/8/134873608/e42d452.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/c43gdti/92165166065.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/d3f04b5a-f05d-446e-a34a-66753edc983e/dipegulexeturo.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/linelakakomezow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d30d2b-963a-4a4a-8632-c6a2f1fa2382/107356464.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/neforifu.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/advanced_mechanics_of_materials_and_applied_elasticity_solutions_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d1194a-ac58-4e8f-8433-0e03b97459ac/2017_gx_460_towing_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6145f551-c7d3-471f-880f-d8f06477edff/53067897579.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/apostrophes_definition_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/84546482937.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/30266172740.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/community_service_hours_sheet_for_court.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/37043525724.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_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 5116 bytes
SHA-256: 7431dd6bdfc785f488bb78a6da03c88d4e6597eba8a5c52fa306170778bf5334
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 10396 bytes
SHA-256: f1da612af7ba4fa7d68e22230147c9ebba92fc994803d319b1bb57442f36c2a9

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