Malicious PDF — malware analysis report

Static analysis result for SHA-256 81783000969d9b52…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 17:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 037a03515291e1a261d3b4a812124625 SHA-1: d7cc7d9455171935ccf04a12b831164b7c4228bf SHA-256: 81783000969d9b52f2dcd934a4f3a3b0a7d40d672a157ecd9b039a40ed9e3e62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'nipisod.ru', likely intended to redirect users to malicious content. The document body, though partially garbled, suggests a lure related to 'audiometria interpreta��o pdf', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://nipisod.ru/award?keyword=audiometria+interpreta%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd27c458e845.pdfIn PDF document text
    • http://life50it.pro/emergency_medicine_physician_jobs_austin_texaseul9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_603b217db0bfc.pdfIn PDF document text
    • http://uscreditmonitoring.info/54849269547ski4z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_60053e1c310e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fc995b841951.pdfIn PDF document text
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/mirukolikiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_602d0c4796c75.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/4376322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5feb78818fb7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_60511e65add98.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/7c933a4a-be34-45ea-bffd-f96fea4bb06b/wefoxala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e404c82-3dd4-40f1-b742-1243993cdfb0/gotogod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ad1f38-ed0d-4d89-9667-232808c8e8d0/46532402599.pdfIn PDF document text
    • http://kepunebo.epizy.com/kupus.pdfIn PDF document text
    • http://zikenonuto.epizy.com/2460111284.pdfIn PDF document text
    • http://demunoj.epizy.com/lease_agreement_example_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a9ae8a-06c4-4a3a-bb28-ef342c805d27/74567147348.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5468 bytes
SHA-256: f3b1372ada2748b4f9e4fe1959cd64399676f00fb2a7254fba7c92092c142577
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 13536 bytes
SHA-256: 50b4031ed1071bccc7919e70023aa832f9d136214beca2d2c3b9eab7d4a8153d

Open this report in the interactive analyzer, or submit your own file for analysis.