Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a3305de6aec11b…

MALICIOUS

PDF

93.5 KB Created: 2021-03-29 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 10d47c1c0caea3a8608b44c3191461cc SHA-1: 10c930eb4ff6cc1fc8eee20fe3e6947f52b6a70c SHA-256: 73a3305de6aec11b72c520be7f26df359b752c03b760261c802c0824a02fbfa7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://xajibur.ru/strik?utm_term=most+important+topics+in+physics+for+neet PDF link annotation
    • https://jatisarekitikez.weebly.com/uploads/1/3/4/6/134661612/aed2f1b4da2.pdfIn PDF document text
    • https://vajalumodo.weebly.com/uploads/1/3/4/3/134390135/lofebodamikuja.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/icIgfFh/lupuroxililosojem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5fca5ed03015b.pdfIn PDF document text
    • https://cdn.sqhk.co/nogupuzejewe/ggP6Xs7/95030101779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_603c1e722945e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5fe38fd804b7a.pdfIn PDF document text
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/531f7e1df.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/noluf-bijozexukozen.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/jfYigic/92685207997.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/gDib5jg/ribaduj.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/figodozugu-zoxiw-xumotivemonuja-fofefape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5fe459f446577.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/netati.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/YBgjaVf/california_dmv_license_renewal_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/94201687580.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/ivern_guide_s8_jungle.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/bekometumun.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/tozow.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/the_odyssey_book_xiv_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/dizivesowirosu.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/general_theory_of_relativity_in_simple_words.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/9719078495.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_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 5328 bytes
SHA-256: 30659d4c99132f2a17e14ced4ee42a256897097cd59d5c2aede2a546f5da9b65
font_01_sfnt_off00014243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14243 11216 bytes
SHA-256: 203513bdc69d88502254d8f790b918a95b8f7254c793270eeb2d5cbaa3da8536

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