Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c32e24368ea49c4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-06 15:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e55a1946efcfa4816c7c4faa392af7c0 SHA-1: 69dd63dde351491af501644eab4ae1f3db2fd30f SHA-256: 1c32e24368ea49c42d2155f8329fe0d7832b7fcf752ab2a85feb327de2af997a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be related to search terms for safes, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/aws?utm_term=bunker+hill+safes+digital+floor+safe PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416326/normal_6008d44e64614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd2877e852e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_603ff42d9021e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fd2c002c2662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_60365a12e6beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_602f23248c5ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ff5d0f4e4403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_601d02a1d5b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_6041eb712417a.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/plate_and_frame_heat_exchanger_cost_estimate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485173/normal_5fcaf8f4cd1f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483082/normal_5ffe97e7932ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_601a022cc2539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_6015dd586e0c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_a8a992c80f174e6dabcf7681bfaa90b4.pdf?index=trueIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_22cc2c679e62448caa13d115ea949b6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95649ab8-4d01-42c4-b736-cb36c4c1253a/31994673852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b113ec-d0a4-4f1b-a3aa-a45c84115e12/17160699979.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_68c0d4c16d7641a29104d61fdd779711.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/81010563857.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_9aa40f75ca5443fb88723cefaaf5993a.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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 5280 bytes
SHA-256: 2693bf40ab90b50d19ce28c6551ae02a9d6a49d38da5823fb03bd2e11e41391e
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 11084 bytes
SHA-256: 16ca23cf4dab3a82155b7d1a1f995455756824a701b75ada1475bbde4ea76c45