Malicious PDF — malware analysis report

Static analysis result for SHA-256 d682e10798812e7a…

MALICIOUS

PDF

77.0 KB Created: 2021-05-20 11:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac80f4b66783626363deca6813356a27 SHA-1: dfd87ad7b823b961b36072908d5efca073afc5f6 SHA-256: d682e10798812e7a8ef1408ba8e8cf801cabb745b9812a969d439f07ab218b31
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to PDF files hosted on various platforms. One of the primary links, 'https://xajibur.ru/strik?utm_term=how+to+read+sheet+music+for+guitars', suggests a lure related to sheet music. The presence of a PDF SEO link farm heuristic and ClamAV detection indicates a phishing or malicious content distribution attempt. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+read+sheet+music+for+guitars PDF link annotation
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/tatojafoloxabeweke.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/753942.pdfIn PDF document text
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/763086b8ac434eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ffcdb3540a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_604f3db7f40f0.pdfIn PDF document text
    • https://rewapukin.weebly.com/uploads/1/3/5/9/135961798/3926071.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/nisitefexotefot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_602b7b6f60b68.pdfIn PDF document text
    • https://xamirudanigux.weebly.com/uploads/1/3/0/9/130969419/meludufo_bevojunararawem_nikenajotusesag_gagakib.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/sinafenimosedixudiru.pdfIn PDF document text
    • https://nunatazireru.weebly.com/uploads/1/3/4/6/134698050/sugikagan.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/niduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_600d51afee007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1ac71f-39c8-43f5-b2df-8f580c6be6f0/vuvoratiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/34650517383.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/avast_free_offline_installer_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/35694578913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95982e0-2de4-494d-8a3f-feb4841712c4/42707739518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff23200-0fc8-40d4-a2ea-9c2a24d50930/gaduposimixinisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff138e6-69a6-4548-8bf3-00109641f86c/rcbs_model_5.10_reloading_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/what_is_the_primary_goal_of_management_accounting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68455137-f1a5-4c6d-b50f-04ed7fbcaf7a/23934180316.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/rojikagasapunukefurovepo.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/vsco_full_pack_gratis_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/41016099533.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 5456 bytes
SHA-256: 62254fafc80a5fe54a7945689a3822f44a581519342386a6e29168a8bcfbff8a
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 10900 bytes
SHA-256: 68151cbf8ad078add66dee1a5ddcff46369d1ad90f16445570c64f39c2003e92