Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b62026b227c4fd…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 16:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 86d75b9c77d2433a2dbbb9bb606552f4 SHA-1: d8a844f430e36fe55b357e6e11e18543e48f39e1 SHA-256: 15b62026b227c4fdc4ba35f801813b1bb9d06ebdd299f3953391948b33497486
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, with one pointing to a PDF hosted on filesusr.com. While the document body is heavily obfuscated, the presence of embedded URLs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://static.s123-cdn-static.com/uploads/4414852/normal_5fccaa527e74a.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366401/normal_5fe23ea4b4d0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=does%20the%20swiffer%20wetjet%20run%20on%20batteriesPDF link annotation
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_686383d9627a4f19820acced8016146e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d51faff-cbbd-43bb-ae43-a7649e044593/pewibapefepuwituzakod.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/cpr_guidelines_1980.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/debebuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/danuvijovib.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/what_would_happen_if_pangaea_still_existed.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_c2ed0ecd93bb4b23acf16998e539cb43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a846731-0f76-42b3-8863-5db8a98296e7/lirokel.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/nuvuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b006ea-58df-4856-9669-d4006a982d55/roninefeboserorirufa.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_6a560808762c4efdb0a6d90d1c1ad461.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_03ea868e67014c48bc62666c2106a16e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a752a301-1460-4abe-8869-bc4474146950/21349482202.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/que_es_un_movimiento_uniformemente_retardado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bc840c-2578-4ac5-afba-5de79dd155d1/56132707408.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/laptop_video_calling_software_free.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_96dcec29c083429eba272940cb021070.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68eb6077-dafd-475e-a8b8-2c37545f1762/39633282091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a832107f-3a75-4d9c-8703-ea3b7f7728d4/dapepimufubobirugirudaji.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_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 5132 bytes
SHA-256: 4add636f5c24eb89149c2a76b14c79f773882b7ede96b90f3584e97bb5b95c4f
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 11244 bytes
SHA-256: 2502a32b70d8e51cc922c664a33511e7127ac4e7b45184aa6a077fe9851905bb

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