Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d7ab569159152e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-30 23:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 261b17dc2964aa5ec45b03124d769f97 SHA-1: 5d8f032f5a11732e0b8467fc7b2501482db0cdc9 SHA-256: 83d7ab569159152e90dc0046d1d813043d39f26ab3af7962a08fc78126de2ea2
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing malware or facilitating phishing. The presence of embedded URLs and a 'download' button lure further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wix?keyword=jetbox+apk+firestick PDF link annotation
    • https://cdn.sqhk.co/rabataxuvax/chbxlia/7787647573.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/4080737.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/0Lhe7sz/kamimufijomejosiluku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450139/normal_5ffb6a02ef4d3.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/gghigiR/90_s_album_songs_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_6017644929b0c.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/xuwanozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_60436a09386d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_6018ad91ee60b.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/3a8bb9.pdfIn PDF document text
    • https://ruruzepekasoto.weebly.com/uploads/1/3/4/7/134753799/vizabuvunaxike.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/c37af1e025697.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/hfT8Vid/45418186004.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/jolojemowitikazawil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5ff29adb15f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_600dae5946e79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_3e78bd1ec56c47fc8b8b7ff6952f5cec.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_8741532bfaaa4984ab523b6cdcb8cacd.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_dc3336ed002b4c7b99fde9a5101ef2fc.pdf?index=trueIn 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_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 5236 bytes
SHA-256: 8143083f297d5ab8fbbd11f9e0cc3d5ed4cd51bc9cc5afc1d13c0d70a1c82ae7
font_01_sfnt_off0001112a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112A 11180 bytes
SHA-256: b0661aab4ac40d5c7f28116b912f0636fe69df3b46ee43a7abffe00f114d47d2

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