Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cb0e0742da97fc…

MALICIOUS

PDF

97.0 KB Created: 2021-04-12 04:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 159703aa4a5ad1218abcc31a4b070c01 SHA-1: 3ecc3a4be250b651f1bf7827a5ed36de01580964 SHA-256: f8cb0e0742da97fc0448d25e7e1ff026a5955121bfab24067f6035b0635b8176
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=christian+dream+interpretation+pdf+download PDF link annotation
    • http://raicen.com/70930801914sgckb.pdfIn PDF document text
    • http://maewallace.com/mysql_query_browser_for_linux_free_download74cb8.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/7jdhijc/build_android_apps_using_python.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://matteset-spon.space/dojuzaworinemuvofiduxami2x6a2.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/fjfghgh/cheap_street_basketball_hoops_for_pools.pdfIn PDF document text
    • https://cdn.sqhk.co/fokivetezabu/wFhikgc/98284555688.pdfIn PDF document text
    • https://cdn.sqhk.co/fomavulobet/UhhfSgh/7090406047.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/gGhithh/mancala_board_dimensions.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/jamuluvuvava/consumer_reports_best_tires.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/lujapa.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_2b7b3760eea7451c813e49ddb0ecd93a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/pefadunezuxetomid.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/80455966749.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_bd9bf3bd891c40249c6cfc0818469cad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/585456821.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/ancient_greek_artifacts_for_sale_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/56515369048.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/65123232047.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_8e63c82b5090479883beeb788431ed50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/rozise.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/maxiscan_ms300_link_error.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/96347261236.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_off00013cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFA 5276 bytes
SHA-256: 5864df2ddcc9b0eaa44f1af8e5fd55a0abd9214597eedae11ce8b2d82fc5f7c3
font_01_sfnt_off00014ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC8 11776 bytes
SHA-256: aaf0ba76b7bc4b79afa8367c563c855dc9c5f7bdb5fa77bf613aff0e4a759ebd

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