Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ec990559f3a4a2…

MALICIOUS

PDF

80.5 KB Created: 2021-03-03 17:33:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 018f0e1a134b7abf54fd1901499db421 SHA-1: ed62e0893eafae11708b208431408dc390e60f1d SHA-256: e8ec990559f3a4a2e5353e25eea4ef70d646bf58bb9bb45d420d1e7b9f7a65ec
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 Weebly and S3-hosted PDFs, suggesting a link farm or redirection scheme. One prominent URL, 'https://resalured.ru/123?utm_term=who+is+the+most+well+known+person+in+history', is embedded within the document's text, indicating a potential phishing or traffic-generation lure. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=who+is+the+most+well+known+person+in+history PDF link annotation
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/5980ddcb8.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/jkhbw4H/65039026812.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/rimawoj-rukutabavugazu-jiwifawil-juwivelunut.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/Z8y9yhd/zoguwabalogemewe.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/tivaselisotera_valazunanudip.pdfIn PDF document text
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/7917131.pdfIn PDF document text
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/davuluxunug.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jhBXiiL/35793298290.pdfIn PDF document text
    • https://timemojorejo.weebly.com/uploads/1/3/1/4/131437846/918b26ad25cf54a.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/sifawekujiki/23255356216.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/28232154683.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/php_fatal_error_class_numberformatter_not_found.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/rirudonitumowudal.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/valefapowironupulesepa.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/dupamukugabagiwobopom.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/xigad.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/hydroponics_for_beginners_essential_hydroponic_gardening_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/manual_tp_link_tl-wa850re_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/xiwaririfekekanabawo.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_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 5120 bytes
SHA-256: fca291f5b0e1f76a4604f0273c14743dae73312e7964c52b6ea1997486e666c5
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 11356 bytes
SHA-256: 65d5f8ed1cbcb692192a88a7f733edf6183f95b5fe5f5850f56ff4ce1f5a3cb8

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