Malicious PDF — malware analysis report

Static analysis result for SHA-256 5811e1891885fa04…

MALICIOUS

PDF

81.8 KB Created: 2021-05-02 06:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7dff91634789f836cd47111e16488a5 SHA-1: 25d5ead5ec28226fc59cc34541b1cbaec1908c5d SHA-256: 5811e1891885fa04f8473d6de6fb13e2d65fafc1330fc48d71ae652e87e10028
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM" containing 30 external PDF links. One prominent URL, https://vilenefex.ru/strik?utm_term=the+house+on+mango+street+sparknotes, suggests a lure related to popular literature, likely to deceive users into clicking. ClamAV also detected this file as "Pdf.Phishing.Trojan". The presence of embedded URLs and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=the+house+on+mango+street+sparknotes
    • http://lilozekakotelup.sportsontheweb.net/fesozawago.pdf
    • http://sivolejujivozul.scienceontheweb.net/24010751309.pdf
    • http://dugarudewemudo.sportsontheweb.net/la_enfermedad_de_alzheimer_diagnostico_y_tratamiento.pdf
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/3970128.pdf
    • http://wowovamofuzo.sportsontheweb.net/ansys_fluent_tutorial.pdf
    • https://toxinezewam.weebly.com/uploads/1/3/1/4/131452950/jakavudeb-wijuviluj.pdf
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/feae9.pdf
    • https://xasatodifugo.weebly.com/uploads/1/3/4/4/134439571/viwoxibidalidudi.pdf
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/diradu-nupurasa-rojebeditenugif-nusiguwebap.pdf
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/5643307.pdf
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/6350824.pdf
    • https://nekewagan.weebly.com/uploads/1/3/4/8/134881830/lebavebuvibaz.pdf
    • http://gujozulogisin.scienceontheweb.net/saregama_carvaan_tamil_songs_list.pdf
    • https://takimibovejexi.weebly.com/uploads/1/3/4/5/134512521/putomemel.pdf
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/7441bd73d.pdf
    • https://zovitixakozi.weebly.com/uploads/1/3/1/4/131483416/8749ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palevijuj/jenn_air_cooktop_gas_downdraft_36.pdf
    • https://s3.amazonaws.com/sazixipame/mugovazi.pdf
    • http://fuguzametekobo.myartsonline.com/lic_jeevan_shanti_form_download.pdf
    • https://s3.amazonaws.com/sevoga/introduction_to_probability_and_statistics_j_susan_milton.pdf
    • https://s3.amazonaws.com/ragejufa/53322404851.pdf
    • https://s3.amazonaws.com/pafiganovavi/batman_gba_games_free.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_off0000eec3.bin
5dd79ad4602b9bee9abf22b1b26c75dfcbed2568c1139040571a756abcf7f811
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 5216 bytes
font_01_sfnt_off00010056.bin
1ba726b086bef3f6af83d7262eb7fd6dceadfdb45620492776acabf38c003256
pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 10416 bytes
font_02_sfnt_off0001244c.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 16204 bytes