Malicious PDF — malware analysis report

Static analysis result for SHA-256 8149626ba59cd336…

MALICIOUS

PDF

84.6 KB Created: 2021-03-14 23:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5743d51e593d15a448a7c3ed2e6e65cf SHA-1: 2d05bb86302417355c4d145813f0738cf34b56c7 SHA-256: 8149626ba59cd3364112645e309c261bb7a44cd19b1942b032d676e07cf14ab0
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The primary URL identified, 'https://resalured.ru/strik?utm_term=fitzpatrick+advanced+calculus+2nd+edition+pdf', is flagged as suspicious and likely serves as a phishing lure. The document body, though heavily obfuscated, appears to contain metadata related to the wkhtmltopdf tool and a search query, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=fitzpatrick+advanced+calculus+2nd+edition+pdf
    • http://febuvirot.22web.org/example_of_abstract_examination_with_answer.pdf
    • http://xexevigaje.22web.org/pearson_textbook_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4409421/normal_6009a8e825787.pdf
    • http://vodaxuf.iblogger.org/mumazenoveb.pdf
    • https://cdn-cms.f-static.net/uploads/4447265/normal_604dc98f34a0d.pdf
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fe3e77721029.pdf
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fc69485dbf3c.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_602ab4d0bcb1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/julaxel/ziforidobologatugiwazix.pdf
    • http://ragomoxos.rf.gd/60407799549.pdf
    • https://uploads.strikinglycdn.com/files/629f30da-b81f-4d39-aef1-55d853e68877/tuwepiditukatopubi.pdf
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_400ab843e62140fe884e82352c34d83c.pdf?index=true
    • https://s3.amazonaws.com/litunux/can_you_install_sheetrock_vertically.pdf
    • http://rapodipowunifo.epizy.com/nikon_coolpix_l310_price.pdf
    • http://xovijoj.epizy.com/maytag_gemini_double_oven_bottom_oven_wont_heat.pdf
    • https://s3.amazonaws.com/dazovosugev/teclado_casio_ctk_2400_manual.pdf
    • http://tudozujuxijoz.rf.gd/the_ruins_of_gorlan_pages.pdf
    • https://s3.amazonaws.com/mupukesunobaga/chirotouch_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/fb91f9ad-1e56-4423-8506-7640fd34677d/naeyc_2010_standards_for_initial_early_childhood_professional_preparation.pdf
    • https://uploads.strikinglycdn.com/files/d9fa879c-668d-4a49-b570-d35f1ee306a3/vibunugal.pdf
    • https://s3.amazonaws.com/jalasilunaz/55753985937.pdf
    • https://uploads.strikinglycdn.com/files/999566e4-cf9a-47cc-bc1e-ef628e2157f7/vudizetevazitej.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_4bdc7a9387be4386bbea1d0e3b114895.pdf?index=true
    • http://boraxatisota.rf.gd/tamixitojil.pdf
    • http://guxajofiv.epizy.com/43120200149.pdf
    • http://jizuvopanusin.rf.gd/nijijemiwewukupax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7df.bin
41b3cd71b0fc8d20e2229e7e3a5cdc3953bc316ac4609fdc48a3be79f7777858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 5412 bytes
font_01_sfnt_off00010a6c.bin
583470fb2d7f90804e8635fd257f580e2ffbf896069c6d6ca27c1d221f8d8522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10736 bytes
font_02_sfnt_off00012f22.bin
f7f944af48a1f29a4fc81369acbb7667dc0c0bb312d09d0e658341ed730dbf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 16144 bytes

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