Malicious PDF — malware analysis report

Static analysis result for SHA-256 6665f3a0e8b702f8…

MALICIOUS

PDF

63.9 KB Created: 2021-03-30 17:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f5b216c4453c5ef1871c17b1081cba6b SHA-1: d36bab97b287d4cf04ce9a2f7ccd00de8be86c95 SHA-256: 6665f3a0e8b702f8085dd399943a624f4e60cd637e7d7caa67331d1a5b318ded
214 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for malicious redirector links, pointing to 'https://yafferge.ru/award?keyword=apostila+curso+de+viol%25C3%25A3o+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'http://vedezanopade.epizy.com/47748965689.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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://yafferge.ru/award?keyword=apostila+curso+de+viol%25C3%25A3o+pdf In PDF document text
    • http://wuvarijawogog.iblogger.org/dowry_prohibition_act_1961_download.pdfIn PDF document text
    • https://giduwopevaxotos.weebly.com/uploads/1/3/5/4/135401458/zagafor.pdfIn PDF document text
    • https://xumexutibivuw.weebly.com/uploads/1/3/2/6/132680998/juboxavomo.pdfIn PDF document text
    • http://maxidadikegi.iblogger.org/dear_mr_kilmer_friendship_sample_answer.pdfIn PDF document text
    • https://fizexafotunuguv.weebly.com/uploads/1/3/1/0/131070009/medidowudaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedezanopade.epizy.com/47748965689.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/24962390282.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/4949487580.pdfIn PDF document text
    • http://biwewoxowimin.rf.gd/14569234389.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/gulidomupelojugifivuladut.pdfIn PDF document text
    • http://topadut.epizy.com/vimegekinikupiduxut.pdfIn PDF document text
    • http://molodetagako.epizy.com/ximasuje.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/java_8_update_201_8u201.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/39129501153.pdfIn PDF document text
    • http://luzafofefo.rf.gd/75349400159.pdfIn PDF document text
    • http://febarufowit.epizy.com/ielts_reading_test._file.pdfIn PDF document text
    • http://saranexujeg.epizy.com/wainwrights_dog_food_puppy_feeding_guide.pdfIn PDF document text
    • http://gomebegamazof.rf.gd/math_algebra_formula.pdfIn PDF document text
    • http://kerenoxubexitip.rf.gd/chinese_zodiac_chart.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_off0000bcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEA 5516 bytes
SHA-256: 9dd373fb23b6cf5145d2d78fefaf01f334afa0b828591d4a7c5bb914f6fcc524
font_01_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 10380 bytes
SHA-256: 7366c9c78fc2a4164103f2f82eff1a9a5b399cd9f1d793e612e43c6780e0bf94

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