Malicious PDF — malware analysis report

Static analysis result for SHA-256 858b84af3f1071ee…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 10:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 894057b68a21cac2e8d1215aa25d55a1 SHA-1: 064da9dd2cee89afd1445cd4e1a6245e9d48e332 SHA-256: 858b84af3f1071ee42b0ba8d0ce5207c42acb64d2ed0d215d9907754959c364c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to suspicious domains, and is flagged by multiple heuristics as malicious and potentially a phishing or scam document. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://midufefew.ru/award?keyword=past+simple+regular+verbs+exercises+negative+and+interrogative+pdf PDF link annotation
    • https://wikexedijul.weebly.com/uploads/1/3/4/6/134659224/xuloxofigubosegojexo.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/Hicgh1G/wolavefiwuzififuma.pdfIn PDF document text
    • http://devlp.design/physiology_book_for_bds_1st_yearmk0ag.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/sawobapesiga.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/JTijig0/balled_my_eyes_out_meaning.pdfIn PDF document text
    • http://sks-expertiza.ru/diff_between_automation_testing_and_manual_testingefhsz.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/ig4nROC/good_riddles_with_answers_easy.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/jeromopelurab/apache_poi_convert_xlsx_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f96c36-0757-4c8b-be2f-6dc440f0ecc0/98950877246.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/ruzaxesipuvikotekikuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/36701930786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455e8481-e2c0-4a84-8358-575328edee91/fimulutak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d6d65d-adfd-4694-a751-74b848b8d594/nojafuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/kobuwosikededoruvulofo.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/electrolyte_repletion_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/21649008953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c5274f-b36c-421c-a4c2-85198f4987b6/aluminum_mig_welding_tips_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de711ad-9d9b-40af-8a98-dd840f16aca6/50914750006.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/what_batteries_does_an_olympus_om10_take.pdfIn 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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 5744 bytes
SHA-256: baad74ef1e052dc010aa908c868d639169d919579c2041513ddbc6b8cdbac4a7
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 11568 bytes
SHA-256: 5ffc21859facf4bd42c703b25ac722ed7cf99d3afa7f1d810df034b96b0e4e7a

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