Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea4b2fb394adc93…

MALICIOUS

PDF

77.0 KB Created: 2021-04-16 01:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b3ed117bd479c0ecb2c0fdae0cebaf19 SHA-1: 24aa319f3e0faf180d4c7d5439e265833698d93d SHA-256: fea4b2fb394adc93d4af4acafdebdf6d567f62714278d60ebba08411fdad3ada
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

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://pelibifir.ru/strik?utm_term=my+name+is+red+quotes PDF link annotation
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/8617783.pdfIn PDF document text
    • http://testersairf.xyz/kudejonobenebetutubucqq1.pdfIn PDF document text
    • http://maleev.online/woodworking_for_dummies_free_downloadzm8rz.pdfIn PDF document text
    • https://pigodebi.weebly.com/uploads/1/3/4/8/134864190/4720772.pdfIn PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/sibuxe.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/9503242.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/ejejfhc/23017341271.pdfIn PDF document text
    • http://luminar4-download.xyz/beretta_1301_comp_pro_owners_manualg44yc.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dFR2bEo/cake_recipes_for_beginners_vanilla.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/zafevirofajon.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/wivumituworetupuji2doc.pdfIn PDF document text
    • http://ukranews.icu/40746034098135c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_80e451b684ed4c75be0d933b4f0faf03.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_6500d0a627fb47d5b8f2be27eb9470cf.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_8c9af473b9ce4cfd9e8930be851f9b32.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_8bebff64be3b47d59d0caaf8631e8f40.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_f986cd621c694e72b089c27f510a51e9.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_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 5172 bytes
SHA-256: e575a220e6ff58d56bc469ce4e60b26c13dba94ce95ddebce793eb297eef10e0
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 10764 bytes
SHA-256: c1b982406bcb4a93e7476a8cf02032284036e1843fc755a34b89eea52942cc77

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