Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ee8601b192cff3…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 22:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc8ca8f5b4b24c65044a657f84be6325 SHA-1: 910868ee48db1efc4769bdca38a7b8db7b548f69 SHA-256: 55ee8601b192cff3ca0b440978eff820c5879b12b685502e9cd30955297aa771
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'piano sheet music' and 'wkhtmltopdf', suggesting a pretext for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=don%2527+t+matter+piano+sheet+music PDF link annotation
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/fesoleguwe.pdfIn PDF document text
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/lojupil.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/fogaxowumim.pdfIn PDF document text
    • https://komipakokituk.weebly.com/uploads/1/3/5/9/135993761/xesebazubov.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/jomafusij.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/zunubulut-kebuliwixum-tadiniva.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/12112.pdfIn PDF document text
    • http://matepiruzozu.iblogger.org/64766372710.pdfIn PDF document text
    • https://rapaxexujimina.weebly.com/uploads/1/3/1/4/131454932/7520948.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/86865679483.pdfIn PDF document text
    • http://banujal.iblogger.org/zizud.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/7528789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genobobef.rf.gd/xuxedukejav.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_a4d66db3cd054fdf91a5283d1d76039a.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_af086ab0de144342a64a902e13f50620.pdf?index=trueIn PDF document text
    • http://dujepuxa.rf.gd/gowizebijegi.pdfIn PDF document text
    • http://maweriza.epizy.com/how_to_find_pilot_light_boiler.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_47f38acfc1ad48f48ae5318f60539a8e.pdf?index=trueIn PDF document text
    • http://lagunuriteg.rf.gd/64911799710.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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 5176 bytes
SHA-256: 0a38b81d8ce73cbbdef8d3e60cca53d1383d1fd6aa75910cfccb3281c0501287
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 10704 bytes
SHA-256: d0b9d37b0b4539d725821e5844b70445be3d2ffdaf21c4bcde53e4944cc08947

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