Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5234181cc217982…

MALICIOUS

PDF

72.0 KB Created: 2021-02-25 01:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff00b7b6372c101a0e1437f242616587 SHA-1: dd6e820c4fb1e15e8ffe9c30eea3a7f9b732e5d0 SHA-256: a5234181cc2179821716b08885b9a43702fc5180d5e038f8e06e97c3165b32a6
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'operating instructions for delonghi oil heater' to entice users to click the malicious links. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=operating+instructions+for+delonghi+oil+heater In PDF document text
    • https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/d3ac3b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fd86ba8d55d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5ffdfce552ef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5ffe50b2ef74a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5ff509056b0e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/iajggdU/dugiwikudutakevumaveva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_5fd62402b1233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_600f80336a00d.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/91942459017.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/gududo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6036d3603de8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_600b1d9eb6f2e.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/fesijivixol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vasofirida/pencil_sketch_art_brush_photoshop_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 5324 bytes
SHA-256: f13493c0d9e5fc2aacfed914fa66c7e988b4b7cec91d8afa76121a487e0b45e6
font_01_sfnt_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 2304 bytes
SHA-256: 2e1640934255b1d07e5b1381dac7269b3f8d307d76562644cd12e18c0c57c83c
font_02_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 10356 bytes
SHA-256: 17225414ffbb5c529650cea768a7aa7b3b2d40f88dc041d371f5d9c07851a480
font_03_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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