Malicious PDF — malware analysis report

Static analysis result for SHA-256 9656336e41e8843e…

MALICIOUS

PDF

85.7 KB Created: 2021-05-14 15:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cacbac556e79ee0031f16bcb44689d05 SHA-1: b290b5d9b874e8e1e84d3113a3b9a446680f9944 SHA-256: 9656336e41e8843ed05efc04125d612221b36543607cc000ee5b0b3e684d7780
156 Risk Score

Malware Insights

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

The PDF document, disguised as a manual, contains a significant number of external links, indicating a potential link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points towards a malicious campaign.

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://jumiwimov.ru/strik?utm_term=sportline+gps+watch+manual
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5fd1c6ef23a9e.pdf
    • https://cdn-cms.f-static.net/uploads/4466165/normal_5fdc42a23fc56.pdf
    • http://budofibo.mygamesonline.org/active_learning_methodology.pdf
    • http://sufawevugut.mywebcommunity.org/can_you_use_milorganite_on_vegetables.pdf
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6034cb4aea60a.pdf
    • http://vixabaj.scienceontheweb.net/xikuzaso.pdf
    • http://kelimap.mywebcommunity.org/50382270623.pdf
    • http://bidizujimon.getenjoyment.net/embarazo_en_la_adolescencia_consecuencias.pdf
    • http://vozivovog.scienceontheweb.net/85550951053.pdf
    • https://wejitefokok.weebly.com/uploads/1/3/1/1/131164199/vorigalakup.pdf
    • https://cdn-cms.f-static.net/uploads/4412896/normal_604da595bdaed.pdf
    • https://cdn-cms.f-static.net/uploads/4418188/normal_602fc80dd9e96.pdf
    • https://cdn-cms.f-static.net/uploads/4392453/normal_606bd65622c0d.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_600da2a535ddb.pdf
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/vorilibasaniz.pdf
    • http://wujejejifi.mygamesonline.org/bank_statement_wells_fargo.pdf
    • https://cdn-cms.f-static.net/uploads/4413017/normal_6066f0011999a.pdf
    • http://bodaweziwov.mypressonline.com/81467646553.pdf
    • https://bujetukojijem.weebly.com/uploads/1/3/4/8/134875379/sebesilabusukexel.pdf
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fccd7f0ceac7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zuputes.atwebpages.com/tudasopijatepu.pdf
    • http://zepizevut.atwebpages.com/kabojusuxiko.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010036.bin
8ee263f8961ea7f07c7aed0a8f67d8dd8f9e7daa2976040163c7bfce1a8dd884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 5424 bytes
font_01_sfnt_off0001128c.bin
c0440fed4c1f9a53ae7932a53139249452b7da222c713f67a26f74c5a3e5e951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 11520 bytes
font_02_sfnt_off000139a8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 4324 bytes

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