Malicious PDF — malware analysis report

Static analysis result for SHA-256 720ffb17f8e94c8e…

MALICIOUS

PDF

78.9 KB Created: 2021-06-13 22:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c678ca27492e2564935845203d39feb SHA-1: 72bc3fe510596d03113a06e2dba12f8305a2526f SHA-256: 720ffb17f8e94c8ecfda2487ada39e2a46f878b527fa11cb44eb706fafac2353
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous external links, forming a link farm, and the document body suggests a lure related to newborn weight growth charts. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=newborn+weight+growth+chart
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/fijukar-jexazexidefa-beganotep-filino.pdf
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fe598c77ae8a.pdf
    • https://kemivepume.weebly.com/uploads/1/3/1/4/131407144/tekonovunoni.pdf
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/rowono.pdf
    • https://geselumagema.weebly.com/uploads/1/3/4/6/134695037/5505777.pdf
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fdae6c3c4d38.pdf
    • https://xofenozupe.weebly.com/uploads/1/3/4/5/134500057/fotibumeburisu.pdf
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/kudegu.pdf
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5ff7667b55250.pdf
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/ebffa.pdf
    • https://cdn-cms.f-static.net/uploads/4470399/normal_606a8572ba218.pdf
    • https://cdn-cms.f-static.net/uploads/4490138/normal_6035f352a5182.pdf
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/3855769338.pdf
    • https://xapebetilozeze.weebly.com/uploads/1/3/0/8/130873864/jemijoreg.pdf
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6011933a3cfda.pdf
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/63f0433d8efe756.pdf
    • https://renenanap.weebly.com/uploads/1/3/4/6/134666424/dinepi_somubisar_mazawiw_sigajijo.pdf
    • https://cdn-cms.f-static.net/uploads/4402720/normal_600aa2ae4a053.pdf
    • https://cdn-cms.f-static.net/uploads/4408195/normal_60bc65955175a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a54134ed-9de1-4d91-b4ac-0bc9bbfaf210/mumiwavenax.pdf
    • https://uploads.strikinglycdn.com/files/4dd113e3-cabf-4ace-9f3a-9743a7a00789/15231772230.pdf
    • https://uploads.strikinglycdn.com/files/ec572195-a3a9-4bcb-b0e6-a61d29f355e1/living_in_balance.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35d.bin
62ce7f6d87999d02a3f8664e835f8f12fccb2ec9c8226b7818326f284f1c36da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 5052 bytes
font_01_sfnt_off000104a4.bin
14bae0687ab40ea0f09d1cacfbda59bde7fe9c15b8907126d4c49b6208d3d415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 12020 bytes

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