Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51dab70cef54b6a…

MALICIOUS

PDF

64.3 KB Created: 2021-02-01 00:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ee812ae50295edb5947e50538b5b68e2 SHA-1: eedefc678b74da2c974f6ea35a9cb9a868500f89 SHA-256: d51dab70cef54b6ad73fa17891bc79b4118e5db19a6a29880372815bb2537842
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The document body, though partially corrupted, suggests a lure related to book discussion questions. The presence of malicious redirector links and the high ML score indicate a phishing or malware distribution attempt.

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/123?utm_term=discussion+questions+for+to+kill+a+mockingbird+chapter+9 In PDF document text
    • http://ompala.store/futevoralk65sa.pdfIn PDF document text
    • http://fb-pageunderreview.com/aptitude_questions_in_tamil_download3b21g.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/4726750.pdfIn PDF document text
    • http://theboldpantsproject.com/muzemajamuwulovihjwof.pdfIn PDF document text
    • http://edalovert.xyz/zovanatudov8cjh0.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/233c5abbaec72e4.pdfIn PDF document text
    • https://sarofufi.weebly.com/uploads/1/3/0/8/130813030/kofedukenagaled.pdfIn PDF document text
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/jukojemuwux.pdfIn PDF document text
    • http://givepamodugag.22web.org/pixitalamoluga.pdfIn PDF document text
    • http://detobusukited.iblogger.org/kezizekakegiw.pdfIn PDF document text
    • http://podarokinsta.site/hungry_shark_evolution_mod_iphone2zb8y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzuvulas.epizy.com/23283127457.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/astm_e84_standard.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/lamigaz.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/bhagwan_baba_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/spotify_music_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/73573583856.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/zazifumogodomaguzukufak.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_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 6052 bytes
SHA-256: 92c66e275e237db41b1ff9014e5cb200e05b329a4bbb4622ebd61cc37ba9cd34
font_01_sfnt_off0000d18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18D 10172 bytes
SHA-256: bc92ad5b25b4ce3291c1ccfb1dc3e9c8c69209c03da1af6d588b1d546031c688

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