Malicious PDF — malware analysis report

Static analysis result for SHA-256 142dd853f09caa82…

MALICIOUS

PDF

67.3 KB Created: 2020-12-16 09:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fb74f498c08470d6568902209ca9a964 SHA-1: 9fcc52242e1163632104e610d0fcf03a7a6051a1 SHA-256: 142dd853f09caa823f0d1c49752d10684fdb5df1665d23188762df57b0eef7c5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to Weebly-hosted PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'The impossible quiz 31', which serves as a lure to encourage users to click on the embedded malicious URLs.

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://trafficel.ru/123?utm_term=the+impossible+quiz+31 PDF link annotation
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/1008940.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/22e187f3f1f.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/gowapawoz.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/ninojafuduzobofiji.pdfIn PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/lidiwaz-letos-vanatupizil-notaki.pdfIn PDF document text
    • https://kofeguku.weebly.com/uploads/1/3/4/5/134587943/gefivosowakiwu.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/dudujopixejikug/loselejivenigunolukivowun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002d40b6b03258f30bf3d/t/5fc1dcd63570fb44d146dd56/1606540504778/gorilla_my_love.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/67955622428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908c48a2-0cfa-44d4-960f-feb302d118dd/loziwoderegose.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/tarezisojisiguwotukij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f99b75-9799-43c3-b7cf-0a986393cb9d/ccna_routing_and_switching_complete.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e0c67848ba205d186e02/t/5fc6271ae18c5c478ecd029e/1606821659694/mijejesuzazizok.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/coraje_el_perro_cobarde_espaol_latino.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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 5236 bytes
SHA-256: 925cf1240e7b94427eca89e03163675346ef7878eef1efcddd6c9989aa319a0a
font_01_sfnt_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 10824 bytes
SHA-256: 6f2655e87e18adf8cacdabe86094862fa841a032bc130a07bf711b1e0549e9a2

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